Java练习题1

题目1：

1. 编程实现，现在有如下的一个数组：

int oldArr[] = {1,3,4,5,0,0,6,6,0,5,4,7,6,7,0,5};

要求将以上数组中值为0的项去掉，将不为0的值存入一个新的数组，生成的新数组为。

int newArr[]={1,3,4,5,6,6,5,4,7,6,7,5};

 1 public class Exer {
 2 
 3     public static int[] getNewArr(int[] arr){
 4         int count=0;
 5         
 6         for(int i : arr) {
 7             if(i != 0) {
 8                 count++;
 9             }
10         }
11         
12         int j = 0;
13         int[] newArr=new int[count];
14         for(int i =0;i<arr.length;i++) {
15             if(arr[i] != 0) {
16                 newArr[j]=arr[i];
17                 j++;
18             }
19         }
20         
21         return  newArr;
22     }
23     
24     public static void main(String args[]) {
25         int oldArr[] = {1,3,4,5,0,0,6,6,0,5,4,7,6,7,0,5};
26         
27         
28         int[] newArr = getNewArr(oldArr);
29         System.out.print("int newArr[]={");
30         for(int i=0;i<newArr.length;i++) {
31             if(i==newArr.length-1) {
32                 System.out.print(newArr[i] + "};");                
33             }else {
34                 System.out.print(newArr[i] + ",");                
35             }
36         }
37     }
38 }

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题目2：编程实现，要求程序输出某两个整数之间的随机整数。

 1 import java.util.Random;
 2 import java.util.Scanner;
 3 
 4 public class exer1 {
 5 
 6     public static void getRandomNumBetweenXAndY(int x,int y) {
 7         Random rand = new Random();
 8         //获取两个数之间的绝对值
 9         int abs = Math.abs(x-y);
10         
11         if(abs <= 1) {
12             System.out.println(x + "和" + y + "之间已经没有随机整数了");
13         }else {
14             //获取两个数之间的随机数，选择最小的数作为底数，然后加上两个值之间的绝对值的随机整数
15             int randomNum =  x > y ? rand.nextInt(abs) + y : rand.nextInt(abs) + x;
16             System.out.println(x + "和" + y + "之间的随机数是：" + randomNum);
17         }
18     }
19     public static void main(String args[]) {
20         //从控制台获取x和y的值
21         Scanner scanner = new Scanner(System.in);
22         System.out.println("请输入x的值");
23         int x = scanner.nextInt();
24         System.out.println("请输入y的值");
25         int y = scanner.nextInt();
26         //调用方法获取x和y之间的随机整数
27         getRandomNumBetweenXAndY(x,y);
28     }
29 }