九九乘法表、冒泡排序、不同形状三角形、猜数字小游戏

package illustration;

public class NiceMutiply {
    public static void main(String[] args) {
        for(int i=1;i<=9;i++){
            for(int j=1;j<=i;j++){
                System.out.print(j+"*"+i+"="+(i*j)+" ");
            }
            System.out.println();//循环完一轮后就换行
        }
    }
}

结果截图

package illustration;

//冒泡排序
public class BubbleSort {
    public void sort(int []a){
        int temp = 0;
        for(int i = a.length-1;i>0;i--){
            for(int j=0;j
                if(a[j+1]
                    temp=a[j+1];
                    a[j+1]=a[j];
                    a[j]=temp;
                }
            }
        }
    }
}

package illustration;

public class BubbleSortTest {
    public static void main(String[] args) {
        //创建数组
        int b[] = new int[10];
        BubbleSort mysort = new BubbleSort();
        System.out.println("输出未排序数组：");
        for(int i=0;i   //为数组随机赋值
            int k = (int)(Math.random()*10+1);
            b[i]=k;
            System.out.print(b[i]+" ");
        }
        System.out.println();
        System.out.println("输出冒泡排序后数组：");
        mysort.sort(b);//排序
        for(int j=0;j
            System.out.print(b[j]+" ");

        }
    }
}

结果截图

package illustration;

import java.util.Scanner;

public class GuessGame {
    public static void main(String[] args) {
        int temp = (int)(Math.random()*100+1);//随机确定一个数作为正确答案
        System.out.println("请输入你猜测的数字：");
        while(true) {
            Scanner scanner = new Scanner(System.in);
            int x = scanner.nextInt();
            if (x == temp) {
                System.out.println("恭喜你猜对了！");
                break;
            } else if (x > temp) {
                System.out.println("你猜大了，再来一次！");
            } else if (x < temp) {
                System.out.println("你猜小了，再来一次！");
            }
        }
    }
}

结果截图

package Sort;

public class Demo1 {
    public static void main(String[] args) {
        for(int i = 1;i<=10;i++){
            for (int j=1;j<=i;j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

结果截图

package Sort;

public class Demo3 {
    public static void main(String[] args) {
        for(int i = 1;i<=10;i++){
            for(int j=10;j>=i;j--){
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

结果截图

package Sort;

public class Demo4 {
   public static void main(String[] args) {
       int k=4;
       for (int i=0;i<=10;i++){
           if(i<=5) {
               for (int j = 0; j < 2 * i + 1; j++) {
                   System.out.print("*");
               }
               System.out.println("");
           }
           else{
               for (int j =0; j< 2 * k + 1; j++)  {
                   System.out.print("*");
               }
               k--;
               System.out.println(" ");
           }
       }
   }
}

结果截图

package Sort;

public class Demo5 {
    public static void main(String[] args) {
        //打印等腰三角形
        for (int i = 1; i <= 10; i++) {//一行一行的来
            for (int j = 10; j >=i; j--) {
                System.out.print(" ");
            }
            for (int m = 1; m <=i; m++) {
                System.out.print("*");
            }
            for (int n = 1; n 
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

结果截图

package Sort;

public class Demo6 {
    public static void main(String[] args) {
        for (int i=1;i<=10;i++){
            for(int j=10;j>=i;j--){
                System.out.print(" ");
            }
            for(int k=1;k<=i;k++){
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

结果截图