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
import java.util.*; public class aa { public static void main(String[] args) { // TODO Auto-generated method stub; int[] a = new int [5] ; Scanner sc = new Scanner (System.in); System.out.println("请依次输入数组各元素的值"); for (int i = 0; i < a.length; i++) { a[i]=sc.nextInt(); } for (int i=0;i<a.length-1;i++) { for(int j=0;j<a.length-i-1;j++) { if(a[j]>a[j+1]) { int x=a[j]; a[j]=a[j+1]; a[j+1]=x; } } } for (int i = 0; i < a.length; i++) { System.out.print(a[i] + " "); } } }
2.定义数组{34,22,35,67,45,66,12,33},输入一个数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"
package a; import java.util.*; public class aa { public static void main(String[] args) { // TODO Auto-generated method stub; int[] a = { 34, 22, 35, 67, 45, 66, 12, 33 }; Scanner sc = new Scanner(System.in); System.out.println("输入数字,我将查找它是否在数组中"); int x = sc.nextInt(); int y = 0; for (int i = 0; i < a.length; i++) { if (x == a[i]) { System.out.println("它的下标为:" + i); y=1; } } if (y == 0) { System.out.println("not found"); } } }
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 a; import java.util.*; public class aa { public static void main(String[] args) { // TODO Auto-generated method stub; double[][] a = new double [4][5]; double x=0.1; Scanner sc = new Scanner(System.in); for(int i=0;i<a.length;i++) { for(int j=0;j<a[i].length;j++) { a[i][j]+=x; x++; } } for(int i=0;i<a.length;i++) { for(int j=0;j<a[i].length;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.
package a; import java.util.*; public class aa { public static void main(String[] args) { // TODO Auto-generated method stub; int[][] a = new int[3][4]; int x = 1; Scanner sc = new Scanner(System.in); for (int i = 0; i < a.length; i++) { for (int j = 0; j < a[i].length; j++) { a[i][j] += x; x++; } } System.out.println("输入数组为:"); int max = 0; for (int i = 0; i < a.length; i++) { for (int j = 0; j < a[i].length; j++) { System.out.print(a[i][j] + " "); if (max < a[i][j]) { max = a[i][j]; } } System.out.println(); } System.out.println("输出的最大值为:" + max); } }