【每日日报】第二十天

1 第三章上机练习

   1.1 冒泡排序：

        

package Line;

import java.util.Arrays; 

public class MaoPao {
    public static void main(String[] args){
    int[] ary= { 1,5,6,9,8,2,3 } ;
    for(int i=0;i<ary.length-1;i++){
        for(int j=0;j<ary.length-i-1;j++){
            if(ary[j]>ary[j+1]){
                int t=ary[j];ary[j]=ary[j+1];ary[j+1]=t;
            }
        }
        
    }
    System.out.println(Arrays.toString(ary));
    }
}

　　1.2 插入排序

package Line;

import java.util.Arrays;

public class ChaRu {
    public static void main(String[] arys){
        int[] ary={1,5,6,9,8,2,3};
        int i,j,k;
        for(i=1;i<ary.length;i++){
            k=ary[i];
            for(j=i-1;j>=0&&k<ary[j];j--){
                ary[j+1]=ary[j];
            }ary[j+1]=k;
        }
        System.out.println(Arrays.toString(ary));
    }

}

　　1.3 选择排序

package Line;

import java.util.Arrays;

public class XuanZe {
    public static void main(String[] args){
        int[] ary = {1,5,6,9,8,2,3};
        for(int i=0;i<ary.length-1;i++){
            for(int j=i+1;j<ary.length;j++){
                if(ary[i]>ary[j]) {
                    int t=ary[i];ary[i]=ary[j];ary[j]=t;
                }
            }
        }
        System.out.println(Arrays.toString(ary));
    }

}

　　2 随机生成五位数并排序

package Array;
import java.util.Arrays;
import java.util.Random;
public class ScPx {
    public static void main(String args[]){
    Random ran = new Random();
    int[] a = new int [5];
    for(int i=0;i<5;i++){
        a[i] = ran.nextInt(10);
    }
    for(int i=0;i<4;i++){
        for(int j=i+1;j<5;j++){
            if(a[i]<a[j]){
                int r=a[i];
                a[i]=a[j];
                a[j]=r;
            }
        }
    }
    System.out.println(Arrays.toString(a)); 
 }
}

　　3 判断最大值

import java.util.*;
public class ZuiDa {
    public static void main(String args[]){
        Scanner s=new Scanner(System.in);
        int a=s.nextInt();
        int b=s.nextInt();
        System.out.print(a>b?a:b);
    }
}

2 没遇到什么问题

3 明天继续看书