Java练习题1

题目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};

 public class Exer {

     public static int[] getNewArr(int[] arr){
         int count=0;

         for(int i : arr) {
             if(i != 0) {
                 count++;
             }
         }

         int j = 0;
         int[] newArr=new int[count];
         for(int i =0;i<arr.length;i++) {
             if(arr[i] != 0) {
                 newArr[j]=arr[i];
                 j++;
             }
         }

         return  newArr;
     }

     public static void main(String args[]) {
         int oldArr[] = {1,3,4,5,0,0,6,6,0,5,4,7,6,7,0,5};

         int[] newArr = getNewArr(oldArr);
         System.out.print("int newArr[]={");
         for(int i=0;i<newArr.length;i++) {
             if(i==newArr.length-1) {
                 System.out.print(newArr[i] + "};");
             }else {
                 System.out.print(newArr[i] + ",");
             }
         }
     }
 }

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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。

 import java.util.Random;
 import java.util.Scanner;

 public class exer1 {

     public static void getRandomNumBetweenXAndY(int x,int y) {
         Random rand = new Random();
         //获取两个数之间的绝对值
         int abs = Math.abs(x-y);

         if(abs <= 1) {
             System.out.println(x + "和" + y + "之间已经没有随机整数了");
         }else {
             //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
             int randomNum =  x > y ? rand.nextInt(abs) + y : rand.nextInt(abs) + x;
             System.out.println(x + "和" + y + "之间的随机数是：" + randomNum);
         }
     }
     public static void main(String args[]) {
         //从控制台获取x和y的值
         Scanner scanner = new Scanner(System.in);
         System.out.println("请输入x的值");
         int x = scanner.nextInt();
         System.out.println("请输入y的值");
         int y = scanner.nextInt();
         //调用方法获取x和y之间的随机整数
         getRandomNumBetweenXAndY(x,y);
     }
 }