控制语句综合代码练习

输出100以内可以被5整除的数，3个一行的输出

public class 输出100以内的质数 {
    public static void main(String[] args) {
      int a,b;
      oute: for (a =2;a<100;a++){
          for (b =2;b<a/2;b++){
              if (a%b==0)
                  continue oute;
          }
          System.out.print(a+" ");
      }

输出100以内的质数

public class 输出1000以内可以被5整除的数 {
    public static void main(String[] args) {
        for (int i = 1; i <= 1000; i++) {
            if (i%5==0){
                System.out.print(i+"\t");
            }
            if (i%15==0){
                System.out.println();
            }
        }
    }
}

判断输入的字符串是否正确

import java.util.Scanner;
public class 判断输入的字符串 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入密码：");
        String pwd = scanner.nextLine();
        if (pwd.equals("admin123")){
            System.out.println("密码正确！");
        }else {
            System.out.println("密码错误！");
        }
        scanner.close();
    }
}

打印三角形

public class 打印三角形 {
    public static void main(String[] args) {
        for (int i = 1; i <=5; i++) {
            for (int j =5;j>=i;j--){
                System.out.print(" ");
            }
            for (int j =1; j<=i;j++){
                System.out.print("*");
            }
            for (int j =1; j<i;j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

九九乘法表

public class 九九乘法表 {
    public static void main(String[] args) {
        for (int i = 1; i <=9 ; i++) {
            for (int j = 1; j <=i ; j++) {
                System.out.print(i+"*"+j+"="+(i*j)+"\t");
                if (i==j){
                    System.out.println();
                }
            }
        }
    }
}

猜数字游戏

import java.util.Scanner;
public class 猜数字游戏 {
    public static void main(String[] args) {
        System.out.print("输入1~100的整数：");
        int i = (int)(99*Math.random())+1;
        Scanner scanner =new Scanner(System.in);
        int j =scanner.nextInt();
        while (i!=j){
            if (i < j) {
                System.out.println("猜大了");
            } else {
                if (i > j) {
                    System.out.println("猜小了");
                }
            }
            System.out.print("再猜：");
            j =scanner.nextInt();
        }
        System.out.println("猜对了！！");
    }
}