JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: Assertion method Assert.assertArrayEquals() example.


Java Class: org.junit.Assert

Assert class provides a set of assertion methods useful for writing tests.

assertArrayEquals() method checks that two object arrays are equal or not. If they are not, it throws an AssertionError with the given message. Incase if expected input and actual inputs are null, then they are considered to be equal. It checks whether both arrays are having same number of elements or not, and all elements should be same. It compares based on the order. If mismatch in order results in failure.


package com.java2novice.junit.tests;

import org.junit.Test;
import static org.junit.Assert.*;

public class MyAssertArrayEqualsTest {

	@Test
	public void myTestMethod(){
		/**
		 * we are demonstrating the usage of assertArrayEquals()
		 * method here, so we are preparing input data here itself.
		 * In real scenario, we will consider the methods returned 
		 * value which suppose to be test, as a input. 
		 */
		//assume that the below array represents expected result
		String[] expectedOutput = {"apple", "mango", "grape"};
		//assuem that the below array is returned from the method 
		//to be tested.
		String[] methodOutput = {"apple", "mango", "grape"};
		assertArrayEquals(expectedOutput, methodOutput);
	}
}

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Java JUnit Examples

  1. Simple JUnit test using @Test annotation.
  2. List of JUnit annotations.
  3. Assertion method Assert.assertArrayEquals() example.
  4. How to do JUnit test for comapring two list of user defined objects?
  5. Assertion method Assert.assertEquals() example.
  6. Assertion method Assert.assertFalse() example.
  7. Assertion method Assert.assertTrue() example.
  8. Assertion method Assert.assertNotNull() example.
  9. Assertion method Assert.assertNull() example.
  10. Assertion method Assert.assertNotSame() example.
  11. Assertion method Assert.assertSame() example.
Knowledge Centre
Stream and types of Streams
A Stream is an abstraction that either produces or consumes information. There are two types of Streams and they are:

Byte Streams: Provide a convenient means for handling input and output of bytes. Byte Streams classes are defined by using two abstract classes, namely InputStream and OutputStream.

Character Streams: Provide a convenient means for handling input & output of characters. Character Streams classes are defined by using two abstract classes, namely Reader and Writer.
Famous Quotations
Insanity: doing the same thing over and over again and expecting different results.
-- Albert Einstein

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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