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 step3;

import java.util.Scanner;

public class HelloStep3 {
	public static void main(String[] args) {
		System.out.println("星级成绩评定系统");
		System.out.println("请输入成绩：");
		Scanner sc = new Scanner(System.in);
		/******start******/
		int scope = sc.nextInt();
		if(scope >=90) {
			System.out.print("*****五星成绩");
		} else if(scope>=80 && scope<90) {
			System.out.print("****四星成绩");
		} else if(scope>=70 && scope<80) {
			System.out.print("***三星成绩");
		} else if(scope>=60 && scope<70) {
			System.out.print("**俩星成绩");
		} else {
			System.out.print("无星成绩");
		}
		
		
		
		
		
		
		/******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*****/
        
    }
}

package step3;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class Task {
	
	public void task() throws IOException{
		/********* Begin *********/
		String file1 = "src/step3/input/input.txt";
		FileReader fr = new FileReader(file1);
		char[] cbuf = new char[8];
		fr.read(cbuf);
		String file2 = "src/step3/output/output.txt";
		FileWriter fw = new FileWriter(file2);
		fw.write(cbuf);
		fr.close();
		fw.flush();
		fw.close();
		/********* End *********/		
	}
}



package step4;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class Task {
    
    public void task() throws IOException{
        /********* Begin *********/
        FileReader fr = new FileReader("src/step4/input/input.txt");
        FileWriter fw = new FileWriter("src/step4/output/output.txt");
        int len = 0;
        char[] cbuf = new char[1024];
        while ((len = fr.read(cbuf))!=-1) 
        {
            fw.write(cbuf,0,len);
        }
        fr.close();
        fw.flush();
        fw.close();
        
        FileInputStream fs = new FileInputStream("src/step4/input/input.jpg");
        FileOutputStream fos = new FileOutputStream("src/step4/output/output.jpg");
        int le = 0;
        byte[] bt = new byte[1024];
        while ((le = fs.read(bt))!=-1)
        {
            fos.write (bt,0,le);
        }
        fs.close();
        fos.flush();
        fos.close();    
        /********* End *********/        
    }
}



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 *********/
}