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@ -1,4 +1,5 @@
# java
高级特性IO流
package step4;
import java.io.FileInputStream;
@ -39,3 +40,372 @@ public class Task {
}
}
分支结构
package step4;
import java.util.Scanner;
public class HelloSwitch {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入月份：");
int input = sc.nextInt(); //获取输入的月份
//通过输入的月份来判断当前季节并输出
/*****start*****/
switch (input) {
case 1:
System.out.println(input+"月是冬天");
break;
case 2:
System.out.println(input+"月是冬天");
break;
case 3:
System.out.println(input+"月是春天");
break;
case 4:
System.out.println(input+"月是春天");
break;
case 5:
System.out.println(input+"月是春天");
break;
case 6:
System.out.println(input+"月是夏天");
break;
case 7:
System.out.println(input+"月是夏天");
break;
case 8:
System.out.println(input+"月是夏天");
break;
case 9:
System.out.println(input+"月是秋天");
break;
case 10:
System.out.println(input+"月是秋天");
break;
case 11:
System.out.println(input+"月是秋天");
break;
case 12:
System.out.println(input+"月是冬天");
break;
}
/*****end*****/
}
}
package step4;
import java.util.Scanner;
public class HelloSwitch {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入月份：");
int input = sc.nextInt(); //获取输入的月份
//通过输入的月份来判断当前季节并输出
/*****start*****/
switch (input) {
case 1:
System.out.println(input+"月是冬天");
break;
case 2:
System.out.println(input+"月是冬天");
break;
case 3:
System.out.println(input+"月是春天");
break;
case 4:
System.out.println(input+"月是春天");
break;
case 5:
System.out.println(input+"月是春天");
break;
case 6:
System.out.println(input+"月是夏天");
break;
case 7:
System.out.println(input+"月是夏天");
break;
case 8:
System.out.println(input+"月是夏天");
break;
case 9:
System.out.println(input+"月是秋天");
break;
case 10:
System.out.println(input+"月是秋天");
break;
case 11:
System.out.println(input+"月是秋天");
break;
case 12:
System.out.println(input+"月是冬天");
break;
}
/*****end*****/
}
}
数组
package step2;
import java.util.Scanner;
public class HelloWorld {
public static void main(String[] args) {
/********** Begin **********/
//在这里定义一个长度为4的字符串数组，用来存放学生姓名
String[] stuNames = new String[]{"张三","张无忌","张三丰","张岁山"} ;
//在这里给stuNames数组赋值 分别为 张三,张无忌,张三丰,张岁山
//在这里输出stuNames数组中的数据
System.out.println("数组中的第一个数据为：" + stuNames[0]);
System.out.println("数组中的第二个数据为：" + stuNames[1]);
System.out.println("数组中的第三个数据为：" + stuNames[2]);
System.out.println("数组中的第四个数据为：" + stuNames[3]);
int[] scores;
Scanner sc = new Scanner(System.in);
//在这里使用Scanner获取系统输入的整数,并用获取到的数据来设置scores数组的长度
int length = sc.nextInt(); ;
scores = new int[length]; ;
/********** End **********/
System.out.println("数组scores的长度为：" + scores.length);
}
}
对象封装
package case1;
public class TestPersonDemo {
public static void main(String[] args) {
/********* begin *********/
// 声明并实例化一Person对象p
Person p = new Person();
// 给p中的属性赋值
p.setName("张三");
p.setAge(18);
// 调用Person类中的talk()方法
p.talk();
/********* end *********/
}
}
// 在这里定义Person类
class Person {
/********* begin *********/
private String name;
private int age;
public String getNmae(){
return name;
}
public void setName(String name){
this.name = name;
}
public int getAge(){
return age;
}
public void setAge(int age){
this.age = age;
}
public void talk(){
System.out.println("我是："+name+"，今年："+age+"岁");
}
/********* end *********/
}
package case2;
public class extendsTest {
public static void main(String args[]) {
// 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
/********* begin *********/
Cat cat = new Cat();
cat.name = "大花猫";
cat.age = "6岁";
cat.voice();
cat.eat();
System.out.println(cat.name+cat.age);
/********* end *********/
// 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
/********* begin *********/
Dog dog = new Dog();
dog.name = "大黑狗";
dog.age = "8岁";
dog.voice();
dog.eat();
System.out.println(dog.name+dog.age);
/********* end *********/
}
}
class Animal {
/********* begin *********/
String name;
String age;
/********* end *********/
}
class Cat extends Animal {
// 定义Cat类的voice()和eat()方法
/********* begin *********/
public void voice(){
System.out.println(name+"喵喵叫");
}
public void eat(){
System.out.println(name+"吃鱼");
}
/********* end *********/
}
class Dog extends Animal {
// 定义Dog类的voice()和eat()方法
/********* begin *********/
public void voice(){
System.out.println(name+"汪汪叫");
}
public void eat(){
System.out.println(name+"吃骨头");
}
/********* end *********/
}
package case7;
public class interfaceTest {
public static void main(String[] args) {
// 实例化一Student的对象s，并调用talk()方法，打印信息
/********* begin *********/
Student s = new Student();
s.talk();
/********* end *********/
}
}
// 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()
interface Person {
/********* begin *********/
String name = "张三";
int age = 18;
String occupation = "学生";
public abstract void talk();
/********* end *********/
}
// Student类继承自Person类 复写talk()方法返回姓名、年龄和职业信息
class Student implements Person {
/********* begin *********/
public void talk() {
System.out.println("学生——>姓名："+name+"，年龄："+age+"，职业："+occupation+"！");
}
/********* end *********/
}
线程
package step1;
//请在此添加实现代码
/********** Begin **********/
public class ThreadClassOne extends Thread{
public int i=0;
public ThreadClassOne(){
super();
}
public void run(){
for(i=0;i<10;i++){
if(i%2==1)
System.out.print(i+" ");
}
}
}
/********** End **********/
package step1;
//请在此添加实现代码
/********** Begin **********/
public class ThreadClassTwo implements Runnable{
public int i=0;
private Thread mythread;
public void run(){
for(i=0;i<11;i++){
if(i%2==0)
System.out.print(i+" ");
}
}
}
/********** End **********/

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