【无标题】

【无标题】

1、输出杨辉三角
package 暑假2022;
import java.util.*;
public class 杨辉三角 {

public static void main(String[] args) {
	// TODO Auto-generated method stub

Scanner sc=new Scanner(System.in) ;
int [][] m=new int[10][10];
int i=0;
int j=0;
for(;i for(;j if(j0||ij) {
m[i][j]=1;
}else {
m[i][j]=m[i-1][j-1]+m[i-1][j];
}
System.out.print(m[i][j]+"t");
}
System.out.println();
}
}

}

2、冒泡排序
package 暑假2022;
import java.util.*;
public class 冒泡 {

public static void main(String[] args) {
	// TODO Auto-generated method stub
        int[] arr={6,3,8,2,9,1};
    System.out.println(Arrays.toString(arr));
        for (int i=0;iarr[j+1]) {
                    temp = arr[j];
                    arr[j] = arr[j+1];
                    arr[j+1] = temp;
                }
            }
        }
    System.out.println(Arrays.toString(arr));
}
}

3、选择排序
package 暑假2022;

import java.util.Arrays;

public class 选择 {

public static void main(String[] args) {
	// TODO Auto-generated method stub

int[] a= {2,34,556,6767,87,54,56,1};
for(int j=0;j
int index=j;
for(int i=1+index;i
if(a[i]
index=i;
}
}
int t=a[j];
a[j]=a[index];
a[index]=t;
System.out.println(Arrays.toString(a));
}
}

}

4、插入排序
package 暑假2022;

public class 插入 {
public static void insertSort(int[] arr) {
if (arr == null || arr.length == 0) return;
for (int i = 0; i < arr.length - 1; i++) {
int value = arr[i + 1];
int j = i;
for (; j >= 0 && arr[j] > value; j–) {
arr[j + 1] = arr[j];
}
arr[j + 1] = value;
System.out.print("第 "+ (i+1) + " 趟: ");
print(arr);
}
}
public static void main(String[] args) {
int[] arr = {6, 9, 1, 4, 5, 8, 7, 0, 2, 3};
System.out.print("排序前: ");
print(arr);
insertSort(arr);

        System.out.print("排序后:  ");
        print(arr);
    }
 

    public static void print(int[] arr) {
        if (arr == null)    return;
 
        for(int i : arr) {
            System.out.print(i + " ");
        }
        System.out.println();
    }
}

5、创建要给长度为6的int类型数组，要求数组元素的值再1-30之间，且随机赋值。同时要求数组元素各不相同
package 暑假2022;
import java.util.*;
public class 数组2 {

public static void main(String[] args) {
	// TODO Auto-generated method stub
	boolean f=true;
	int[] d= new int[6];
	int index=0;
	Random num=new Random();

while (true) {
int h=num.nextInt(30)+1;

for(int i=0;i<=index;i++) {

if(h==d[i]) {
f=false;
break;
}

}
if(f) {
d[index]=h;
index++;
if(index==6) {
break;
}

}
}
System.out.println(Arrays.toString(d));
}

}