循环创建自定义字符串

Question

我正在循环将数据写入字符串数组。但我想要的是，我创建了另一个循环，我将遍历values的数据，最多为amount，但我想就如何这样做提供一些指导。

String[] s = new String[20]; 
String[] values = { "A", "B", "C", "D" }; 
final int amount = 2; 

for (int i = 0; i < s.length; i++) { 
    s[i] = String.format("%s%04d", values[0], i); //TODO create another loop? 
} 
System.out.println(Arrays.toString(s)); 

的首选输出应该是：

A0000, A0001, B0002, B0003, C0004, ... 

实际的输出是：

A0000, A0001, A0002, A0003, A0004, ... 

Answer 1

问题：你的循环是错误的。

试试这个：

public static void main(String[] args) { 

      int k=0; 
      String[] s = new String[20]; 
      String[] values = { "A", "B", "C", "D" }; 
      final int amount = 2; 
      for (int i = 0; i < values.length; i++){ 

       for (int j = 0; j < amount; j++){ //data of values as much as amount 
        s[k++] = String.format("%s%04d", values[i], k); 
       } 
      } 
      System.out.println(Arrays.toString(Arrays.copyOf(s,k))); 
    } 

输出：

[A0001, A0002, B0003, B0004, C0005, C0006, D0007, D0008] 

Answer 2

用户需要通过实际values阵列有2个回路一个循环，然后另外一个则是amount（次数） 。

试试这个

List<String> a = new ArrayList<String>(); 
    String[] values = { "A", "B", "C", "D" }; 
    final int amount = 2; 
    int incrementVariable = 0; 
    for (int i = 0; i < values.length; i++){ 
     for(int j = 0; j< amount; j++){ 
      a.add(String.format("%s%04d", values[i], incrementVariable)); 
      incrementVariable +=1; 
     } 
    } 
    System.out.println(a); 
} 

输出：

[A0000, A0001, B0002, B0003, C0004, C0005, D0006, D0007] 

Answer 3

我喜欢while循环更好:)

String[] s = new String[10]; 
String[] values = {"A", "B", "C", "D"}; 
final int amount = 2; 

for (int i = 0; i < values.length; ++i) { 
    int buffer = 0; 
    while(buffer <= amount) { 
     int index = i * amount + buffer; 
     s[index] = values[i] + String.format("%04d", index); 
     buffer++; 
    } 
} 

System.out.println(Arrays.toString(s)); 

[A0000，A0001，B0002，B0003，C0004，C0005 ，D0006，D0007，D0008，null]