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线程
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package step1;
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//请在此添加实现代码
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/********** Begin **********/
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public class ThreadClassOne extends Thread{
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public int i=0;
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public ThreadClassOne(){
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super();
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}
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public void run(){
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for(i=0;i<10;i++){
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if(i%2==1)
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System.out.print(i+" ");
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}
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}
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}
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/********** End **********/
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package step3;
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import java.util.Scanner;
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public class HelloStep3 {
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public static void main(String[] args) {
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System.out.println("星级成绩评定系统");
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System.out.println("请输入成绩：");
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Scanner sc = new Scanner(System.in);
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/******start******/
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int scope = sc.nextInt();
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if(scope >=90) {
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System.out.print("*****五星成绩");
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} else if(scope>=80 && scope<90) {
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System.out.print("****四星成绩");
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} else if(scope>=70 && scope<80) {
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System.out.print("***三星成绩");
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} else if(scope>=60 && scope<70) {
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System.out.print("**俩星成绩");
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} else {
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System.out.print("无星成绩");
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}
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/******end******/
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}
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}
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package step4;
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import java.util.Scanner;
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public class HelloSwitch {
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public static void main(String[] args) {
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Scanner sc = new Scanner(System.in);
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System.out.println("请输入月份：");
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int input = sc.nextInt(); //获取输入的月份
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//通过输入的月份来判断当前季节并输出
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/*****start*****/
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switch (input) {
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case 1:
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System.out.println(input+"月是冬天");
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break;
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case 2:
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System.out.println(input+"月是冬天");
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break;
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case 3:
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System.out.println(input+"月是春天");
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break;
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case 4:
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System.out.println(input+"月是春天");
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break;
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case 5:
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System.out.println(input+"月是春天");
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break;
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case 6:
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System.out.println(input+"月是夏天");
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break;
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case 7:
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System.out.println(input+"月是夏天");
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break;
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case 8:
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System.out.println(input+"月是夏天");
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break;
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case 9:
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System.out.println(input+"月是秋天");
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break;
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case 10:
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System.out.println(input+"月是秋天");
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break;
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case 11:
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System.out.println(input+"月是秋天");
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break;
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case 12:
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System.out.println(input+"月是冬天");
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break;
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}
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/*****end*****/
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}
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}
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package step3;
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import java.io.FileNotFoundException;
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import java.io.FileReader;
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import java.io.FileWriter;
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import java.io.IOException;
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public class Task {
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public void task() throws IOException{
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/********* Begin *********/
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String file1 = "src/step3/input/input.txt";
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FileReader fr = new FileReader(file1);
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char[] cbuf = new char[8];
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fr.read(cbuf);
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String file2 = "src/step3/output/output.txt";
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FileWriter fw = new FileWriter(file2);
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fw.write(cbuf);
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fr.close();
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fw.flush();
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fw.close();
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/********* End *********/
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}
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}
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package step4;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.FileReader;
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import java.io.FileWriter;
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import java.io.IOException;
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public class Task {
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public void task() throws IOException{
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/********* Begin *********/
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FileReader fr = new FileReader("src/step4/input/input.txt");
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FileWriter fw = new FileWriter("src/step4/output/output.txt");
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int len = 0;
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char[] cbuf = new char[1024];
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while ((len = fr.read(cbuf))!=-1)
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{
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fw.write(cbuf,0,len);
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}
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fr.close();
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fw.flush();
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fw.close();
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FileInputStream fs = new FileInputStream("src/step4/input/input.jpg");
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FileOutputStream fos = new FileOutputStream("src/step4/output/output.jpg");
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int le = 0;
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byte[] bt = new byte[1024];
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while ((le = fs.read(bt))!=-1)
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{
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fos.write (bt,0,le);
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}
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fs.close();
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fos.flush();
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fos.close();
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/********* End *********/
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}
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}
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package case1;
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public class TestPersonDemo {
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public static void main(String[] args) {
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/********* begin *********/
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// 声明并实例化一Person对象p
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Person p = new Person();
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// 给p中的属性赋值
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p.setName("张三");
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p.setAge(18);
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// 调用Person类中的talk()方法
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p.talk();
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/********* end *********/
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}
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}
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// 在这里定义Person类
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class Person {
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/********* begin *********/
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private String name;
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private int age;
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public String getNmae(){
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return name;
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}
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public void setName(String name){
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this.name = name;
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}
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public int getAge(){
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return age;
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}
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public void setAge(int age){
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this.age = age;
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}
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public void talk(){
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System.out.println("我是："+name+"，今年："+age+"岁");
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}
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/********* end *********/
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}
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package case2;
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public class extendsTest {
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public static void main(String args[]) {
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// 实例化一个Cat对象，设置属性name和age，调用voice()和eat()方法，再打印出名字和年龄信息
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/********* begin *********/
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Cat cat = new Cat();
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cat.name = "大花猫";
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cat.age = "6岁";
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cat.voice();
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cat.eat();
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System.out.println(cat.name+cat.age);
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/********* end *********/
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// 实例化一个Dog对象，设置属性name和age，调用voice()和eat()方法，再打印出名字和年龄信息
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/********* begin *********/
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Dog dog = new Dog();
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dog.name = "大黑狗";
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dog.age = "8岁";
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dog.voice();
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dog.eat();
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System.out.println(dog.name+dog.age);
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/********* end *********/
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}
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}
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class Animal {
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/********* begin *********/
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String name;
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String age;
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/********* end *********/
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}
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class Cat extends Animal {
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// 定义Cat类的voice()和eat()方法
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/********* begin *********/
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public void voice(){
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System.out.println(name+"喵喵叫");
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}
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public void eat(){
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System.out.println(name+"吃鱼");
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}
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/********* end *********/
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}
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class Dog extends Animal {
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// 定义Dog类的voice()和eat()方法
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/********* begin *********/
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public void voice(){
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System.out.println(name+"汪汪叫");
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}
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public void eat(){
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System.out.println(name+"吃骨头");
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}
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/********* end *********/
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}
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package case7;
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public class interfaceTest {
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public static void main(String[] args) {
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// 实例化一Student的对象s，并调用talk()方法，打印信息
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/********* begin *********/
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Student s = new Student();
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s.talk();
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/********* end *********/
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}
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}
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// 声明一个Person接口，并在里面声明三个常量：name、age和occupation，并分别赋值，声明一抽象方法talk()
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interface Person {
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/********* begin *********/
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String name = "张三";
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int age = 18;
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String occupation = "学生";
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public abstract void talk();
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/********* end *********/
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}
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// Student类继承自Person类 复写talk()方法返回姓名、年龄和职业信息
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class Student implements Person {
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/********* begin *********/
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public void talk() {
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System.out.println("学生——>姓名："+name+"，年龄："+age+"，职业："+occupation+"！");
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}
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/********* end *********/
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}
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