如何让用户控制数组中的输入？

Question

我有没有程序只允许用户输入一个号码

import java.util.Scanner; 

public class ArrayEvenNumber { 

     public static void main (String[] args) 
     { 

      int i,x,a[] = new int[10]; 



      Scanner input = new Scanner(System.in); 


      //user input 
      for(i=0;i<10;i++) 
      { 
      System.out.println("Enter Number :"); 
      System.out.println("Enter -1 When Finished"); 
      a[i] = input.nextInt(); 
      //printing the data 
      System.out.println("The integers you've entered are : "); 
      for (i=0;i<a.length;i++) 
       System.out.println(a[i]); 


      } 

      System.out.println("Even Numbers are :-"); 
      //showing the even numbers 
      for(i=0;i<10;i++) 
      { 
       x=a[i]%2; 
       if(x==0) 
       System.out.println(a[i]); 
      } 
     } 
} 

Answer 1

您只需要打印数据当您完成将在数据显示的数据的问题。

for(i=0;i<10;i++) 
    { 
    System.out.println("Enter Number :"); 
    System.out.println("Enter -1 When Finished"); 
    a[i] = input.nextInt(); 

    } 
//printing the data 
    System.out.println("The integers you've entered are : "); 
    for (i=0;i<a.length;i++) 
     System.out.println(a[i]); 

另外，我注意到你的整个代码可以使用一些改进：

Scanner input = new Scanner(System.in); 


System.out.println("Enter Number :"); 
System.out.println("Enter -1 When Finished"); 

int entered = 0; 
int counter = 0; 
while(counter < a.length) { 
    entered = input.nextInt(); 
    if(entered == -1) break; 
    a[counter] = entered; 
    counter++; 
} 


System.out.println("The integers you've entered are : "); 
for (i=0;i<a.length;i++) 
    System.out.println(a[i]); 
}