Java中的while无限循环结构及实例

while(循环条件)

{
循环体；
}

int x = 1;
       while(x<=10)

        {
        System.out.println("Hello World!");
        }

do

{ 循环体

}while(循环条件)

int j = 10;

do

{System.out.println("Hello World");

} while (j < 3);

import java.util.Scanner;
 
public class number {
 
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		 	Scanner in= new Scanner(System.in);
	        int number = (int) (Math.random() * 100); 
	        int a = 0;
	        int count = 0;
	        System.out.println("猜一个1到100的整数");
	        do {
	            a = in.nextInt();
	            if (number < a) {
	                System.out.println("大了");
	                count++;
	            } else if (number > a) {
	                System.out.println("小了");
	                count++;
	            } else {
	                count++;
	                break;
	            }
	        } while (true);
	         System.out.println("这个数字是"+number + "您猜的次数是"+count);
	}
 
}

import java.util.Scanner;
 
public class average {
 
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		 	Scanner in= new Scanner(System.in);
	        int count = 0;
	        int number = 0;
	        int sum = 0;
	        number = in.nextInt();
	        while (number != -1)
	        {
	        	sum += number;
	        	count += 1;
	        	number = in.nextInt();
	        }
	         System.out.println("平均数为"+(double)(sum/count));
	}
 
}