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Java - compare arrays

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Created by:

Tomeriko

413

In this short article, we would like to show how to compare 2 arrays in Java.

Note: as arrays comparision we understand comparision on array items.

Quick solution:

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// import java.util.Arrays;
​
String[] a = {"1", "2", "3"};
String[] b = {"1", "2", "3"};
​
System.out.println(Arrays.equals(a, b));  // true

Items comparion example

Edit

In this section, we can see items comparions example.

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import java.util.Arrays;
​
public class HelloWorld{
​
     public static void main(String []args){
​
        String[] a = {"1", "2", "3"};
        String[] b = {"1", "2", "3"};
​
        System.out.println(Arrays.equals(a, b));  // true
     }
}

Output:

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true

References comparion example

Edit

The example presented in this section is useful when we want to check if 2 variables indicate same array.

xxxxxxxxxx
 
import java.util.Arrays;
​
public class HelloWorld{
​
    public static void main(String []args){
​
        String[] a = {"1", "2", "3"};
        String[] b = {"1", "2", "3"};
​
        System.out.println(a == b);  // false
        System.out.println(a == a);  // true
        System.out.println(b == b);  // true
    }
}