1.定义长度位5的整型数组,输入他们的值用冒泡排序后输出
1 package test3;
2
3 public class test3 {
4 public static void main(String[] args) {
5 int[] a = new int[] { 4, 3, 1, 10, 5 };
6 int t;
7 for (int i = 0; i < a.length-1; i++) {
8 for (int j = 0; j < a.length-1-i;j++) {
9 if (a[j + 1] > a[j]) {
10 t = a[j];
11 a[j] = a[j + 1];
12 a[j + 1] = t;
13 }
14 }
15 }
16 for (int j = 0; j < a.length; j++) {
17 System.out.print(a[j] + ", ");
18 }
19 }
20 }
2.定义数组{34,22,35,67 ,45,66,12,33}输入-个数a,查找在数组中是否存在,如果存在,输出下标,不存在输出"not found"
1 package test3;
2
3 import java.util.*;
4
5 public class test3 {
6 public static void main(String[] args) {
7 Scanner input = new Scanner(System.in);
8 int[] n = new int[] { 34, 22, 35, 67, 45, 66, 12, 33 };
9 System.out.println("输入一个数");
10 int a = input.nextInt();
11 int f=0,i,t=0;
12 for (i = 0; i < n.length; i++) {
13 if (a == n[i]){
14 f=1;
15 t=i;
16 }
17 }
18 if(f==1){
19 System.out.println("该数存在即下标为:" + t);
20 }
21 else{
22 System.out.println("not found");
23 }
24
25 }
26 }
3.以矩阵的形式输出一-个double型二维数组(长度分别为5、4 ,值自己设定)的值
package test3;
public class test3 {
public static void main(String[] args) {
double[][] a=new double[5][4];
for(int i=0;i<5;i++){
for(int j=0;j<4;j++){
System.out.print(a[i][j]+" ");
}
System.out.println();
}
}
}
4.定义一个二维数组(长度分别为3,4,值自己设定),求该二维数组的最大值.
1 package test3;
2
3 public class test3 {
4 public static void main(String[] args) {
5
6 int[][] a={{3,4,5},{1,6,7},{12,21,1},{8,12,10}};
7 int t=a[0][0];
8 for(int i=0;i<4;i++){
9 for(int j=0;j<3;j++){
10 if(a[i][j]>t){
11 t=a[i][j];
12 }
13 }
14 }
15 System.out.println("最大为:"+t);
16 }
17 }