第三個內部while while循環不工作

Question

在blow code內部第三個while while循環不工作請告訴我爲什麼？ 在這裏，我試圖用for循環替換第三個內部while循環它正常工作，但爲什麼不用while while循環.....？你能給我真正的理由嗎？

import java.util.Scanner; 
public class MergeArray { 

    void arrayInitialization(Scanner arg) { 
     //entering test cases 
     System.out.println("enter test cases"); 
     int t = arg.nextInt(); 
     int k, l, i; 
     k = 0; 
     l = 0; 
     i = 0; 
     //outer while loop 
     while (t-- > 0) { 
      //initializing a1[]'s size 
      System.out.println("enter a1[]'s size"); 
      int as1 = arg.nextInt(); 
      int a1[] = new int[as1]; 
      //inner while loop-1 
      while (as1-- > 0) { 
       System.out.println("enter a1[]'s elements"); 
       a1[i] = arg.nextInt(); 
       System.out.print(a1[i]); 
       i++; 
      } 
      i = 0; 
      //initializing a2[]'s size 
      System.out.println("enter a2[]'s size"); 
      int as2 = arg.nextInt(); 
      int a2[] = new int[as2]; 
      //inner while loop-2 
      while (as2-- > 0) { 
       System.out.println("enter a2[]'s elements"); 
       a2[i] = arg.nextInt(); 
       System.out.print(a2[i]); 
       i++; 
      } 
      System.out.println(); 
      int a3[] = new int[a1.length + a2.length]; 
      int size = as1 + as2; 
      //inner while loop-3 
      while (size-- > 0) { 
       if (k < a1.length) 
        a3[l] = a1[k]; 
       if (k < a2.length) 
        a3[l + 1] = a2[k]; 
       k++; 
       l += 2; 
      } 
      for (int j = 0; j < (a1.length + a2.length); j++) { 
       System.out.print(a3[j]); 
      } 
     } 
    } 
    public static void main(String[] args) { 
     MergeArray ma = new MergeArray(); 
     Scanner sc = new Scanner(System. in); 
     ma.arrayInitialization(sc); 
    } 
} 

我試了很多，但沒有找到解決方案。這裏我使用while循環，因爲我知道while循環將快速工作，而不是循環。

Answer 1

它不起作用，因爲您正在遞減as1和as2的尺寸。這將是

int size = as1 + as2; // size = 0 + 0; 

而是你可以使用數組長度例如

int size = as1.length + as2.length; 

Answer 2

穆拉特·K公司的答案是正確的，但要儘量初始化這樣的數組：

 //init a1 
     System.out.println("enter a1[]'s size"); 
     int a1[] = new int[arg.nextInt()]; 

     //fill a1 
     for (int i = 0; i < a1.length; i++) { 
      System.out.println("enter element " + i + " of a1[]"); 
      a1[i] = arg.nextInt(); 
     } 

     //init a2 
     System.out.println("enter a2[]'s size"); 
     int a2[] = new int[arg.nextInt()]; 

     //fill a2 
     for (int i = 0; i < a2.length; i++) { 
      System.out.println("enter element " + i + " of a2[]"); 
      a2[i] = arg.nextInt(); 
     } 

     //init a3 
     int a3[] = new int[a1.length + a2.length]; 

     //merge a1 and a2 into a3 
     for (int i = 0; i < a1.length; i++) { 
      a3[i] = a1[i]; 
     } 
     for (int i = 0; i < a2.length; i++) { 
      a3[a1.length + i] = a2[i]; 
     } 

     //print 
     for (int i : a3) { 
      System.out.print(i); 
     }