Question

How to concatenate two string arrays in Java

Answer 1

public class Main {
    public static void main(String[] args) {
        String[] array1 = {"aaa", "bbb"};
        String[] array2 = {"ccc", "ddd", "eee"};
        
        String[] result = new String[array1.length + array2.length];
        
        System.arraycopy(array1, 0, result, 0, array1.length);
        System.arraycopy(array2, 0, result, array1.length, array2.length);
        
        for (String str : result) {
            System.out.print(str + " ");
        }
    }
}

   
   
/*
run:
   
aaa bbb ccc ddd eee 
  
*/

 

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Answer 2

import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        String[] array1 = {"aaa", "bbb"};
        String[] array2 = {"ccc", "ddd", "eee"};
        
        String[] result = Arrays.copyOf(array1, array1.length + array2.length);
        System.arraycopy(array2, 0, result, array1.length, array2.length);
        
        for (String str : result) {
            System.out.print(str + " ");
        }
    }
}

   
   
/*
run:
   
aaa bbb ccc ddd eee 
  
*/

 

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Answer 3

import java.util.Arrays;
import java.util.stream.Stream;

public class Main {
    public static void main(String[] args) {
        String[] array1 = {"aaa", "bbb"};
        String[] array2 = {"ccc", "ddd", "eee"};
        
        String[] result = Stream.concat(Arrays.stream(array1), Arrays.stream(array2))
                                .toArray(String[]::new);
        
        for (String str : result) {
            System.out.print(str + " ");
        }
    }
}

   
   
/*
run:
   
aaa bbb ccc ddd eee 
  
*/

 

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