返回字符串數組的方法和打印返回數組

Question

如何從一個方法返回一個string[]：

public String[] demo 
{ 
    String[] xs = new String {"a","b","c","d"}; 
    String[] ret = new String[4]; 
    ret[0]=xs[0]; 
    ret[1]=xs[1]; 
    ret[2]=xs[2]; 
    ret[3]=xs[3]; 

    retrun ret; 
} 

這是正確的，因爲我嘗試過了，也沒有工作。如何在main方法中打印返回的字符串數組。

Answer 1

你的代碼不會編譯。它遭受很多問題（包括語法問題）。

您有語法錯誤 - retrun應該是return。

demo後，你應該有括號（空，如果你不需要參數）

另外，String[] xs = new String {"a","b","c","d"};

應該是：

String[] xs = new String[] {"a","b","c","d"};

您的代碼應該是這個樣子：

public String[] demo() //Added() 
{ 
    String[] xs = new String[] {"a","b","c","d"}; //added [] 
    String[] ret = new String[4]; 
    ret[0]=xs[0]; 
    ret[1]=xs[1]; 
    ret[2]=xs[2]; 
    ret[3]=xs[3]; 
    return ret; 
} 

放在一起：

public static void main(String args[]) 
{ 
    String[] res = demo(); 
    for(String str : res) 
     System.out.println(str); //Will print the strings in the array that 
}         //was returned from the method demo() 


public static String[] demo() //for the sake of example, I made it static. 
{ 
    String[] xs = new String[] {"a","b","c","d"}; 
    String[] ret = new String[4]; 
    ret[0]=xs[0]; 
    ret[1]=xs[1]; 
    ret[2]=xs[2]; 
    ret[3]=xs[3]; 
    return ret; 
} 

Answer 2

試試這個：

//... in main 
String [] strArr = demo(); 
for (int i = 0; i < strArr.length; i++) { 
    System.out.println(strArr[i]); 
} 

//... demo method 
public static String[] demo() 
{ 
    String[] xs = new String [] {"a","b","c","d"}; 
    return xs; 
}