Java Arrays compare() Method

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Description

The Java Arrays compare(boolean[] a, boolean[] b) method compares the two arrays of booleans lexicographically. In case of null arrays comparison, arrays are considered equals and a null array is lexicographically less than a not null array.

Declaration

Following is the declaration for java.util.Arrays.compare(boolean[] a, boolean[] b) method

public static int compare(boolean[] a, boolean[] b)

Parameters

• a − This is the first array to be compared.

• b − This is the second array to be compared.

Return Value

This method returns the value 0 if the first and second array are equal and contain the same elements in the same order; a value less than 0 if the first array is lexicographically less than the second array; and a value greater than 0 if the first array is lexicographically greater than the second array.

Exception

NA

Java Arrays compare(boolean[] a, int aFromIndex, int aToIndex, boolean[] b, int bFromIndex, int bToIndex) Method

Description

The Java Arrays compare(boolean[] a, int aFromIndex, int aToIndex, boolean[] b, int bFromIndex, int bToIndex) method compares the two arrays of booleans in the given ranges lexicographically. In case of any array null, a NullPointerException is thrown.

Declaration

Following is the declaration for java.util.Arrays.compare(boolean[] a, int aFromIndex, int aToIndex, boolean[] b, int bFromIndex, int bToIndex) method

public static int compare(boolean[] a, int aFromIndex, int aToIndex, boolean[] b, int bFromIndex, int bToIndex)

Parameters

• a − This is the first array to be compared.

• aFromIndex − This is the index of the first element (inclusive) of first array to be compared.

• aToIndex − This is the index of the last element (exclusive) of first array to be compared.

• b − This is the second array to be compared.

• bFromIndex − This is the index of the first element (inclusive) of second array to be compared.

• bToIndex − This is the index of the last element (exclusive) of second array to be compared.

Return Value

This method returns the value 0 if, over the specified ranges, the first and second array are equal and contain the same elements in the same order; a value less than 0 if, over the specified ranges, the first array is lexicographically less than the second array; and a value greater than 0 if, over the specified ranges, the first array is lexicographically greater than the second array.

Exception

• IllegalArgumentException − if aFromIndex > aToIndex or if bFromIndex > bToIndex

• ArrayIndexOutOfBoundsException − if aFromIndex < 0 or aToIndex > a.length or if bFromIndex < 0 or bToIndex > b.length

• NullPointerException − if either array is null

Comparing Two Arrays of Same boolean Values Example

The following example shows the usage of Java Arrays compare(boolean[], boolean[]) method. First, we've created two arrays of same booleans, and compared them using compare() method. As per the result, the comparison is printed.

package com.tutorialspoint;

import java.util.Arrays;

public class ArrayDemo {
   public static void main(String[] args) {

      // initialize first boolean array
      boolean array1[] = { false, false, true, true, false};

      // initialize second boolean array
      boolean array2[] = { false, false, true, true, false};
            
      int result = Arrays.compare(array1, array2);
      
      if(result > 0) {
    	  System.out.println("First array is greater than second array.");
      } else if (result == 0) {
    	  System.out.println("Arrays are same.");
      } else {
    	  System.out.println("First array is less than second array.");
      }
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Arrays are same.

Comparing Two Sub-Arrays of boolean Values Example

The following example shows the usage of Java Arrays compare(boolean[] a, int aFromIndex, int aToIndex, boolean[] b, int bFromIndex, int bToIndex) method. First, we've created two arrays of different booleans, and compared them using compare() method. As per the result, the comparison is printed.

package com.tutorialspoint;

import java.util.Arrays;

public class ArrayDemo {
   public static void main(String[] args) {

      // initialize first boolean array
      boolean array1[] = { false, false, true, true, false};

      // initialize second boolean array
      boolean array2[] = { false, true, true, true, false};
      
      int result = Arrays.compare(array1, 0, 2, array2, 0, 2);
      
      if(result > 0) {
    	  System.out.println("First array is greater than second array.");
      } else if (result == 0) {
    	  System.out.println("Arrays are same.");
      } else {
    	  System.out.println("First array is less than second array.");
      }
   }
}

Output

Let us compile and run the above program, this will produce the following result −

First array is less than second array.

Comparing Two Arrays of Different boolean Values Example

The following example shows the usage of Java Arrays compare(boolean[], boolean[]) method. First, we've created two arrays of different booleans, and compared them using compare() method. As per the result, the comparison is printed.

package com.tutorialspoint;

import java.util.Arrays;

public class ArrayDemo {
   public static void main(String[] args) {

      // initialize first boolean array
      boolean array1[] = { false, true, true, true, false};

      // initialize second boolean array
      boolean array2[] = { false, false, true, true, false};
      
      int result = Arrays.compare(array1, array2);
      
      if(result > 0) {
    	  System.out.println("First array is greater than second array.");
      } else if (result == 0) {
    	  System.out.println("Arrays are same.");
      } else {
    	  System.out.println("First array is less than second array.");
      }
   }
}

Output

Let us compile and run the above program, this will produce the following result −

First array is greater than second array.