JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: Assertion method Assert.assertNotNull() example.


Java Class: org.junit.Assert

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

Assert.assertNotNull() methods checks that the object is null or not. If it is null then it throws an AssertionError.


package com.java2novice.junit.tests;

import java.util.HashMap;
import java.util.Map;
import static org.junit.Assert.*;
import org.junit.Test;

public class MyAssertNotNullTest {

	public String getPropValue(final String key){
		Map appProps = new HashMap();
		appProps.put("key1", "value 1");
		appProps.put("key2", "value 2");
		appProps.put("key3", "value 3");
		return appProps.get(key);
	}
	
	@Test
	public void test(){
		MyAssertNotNullTest msnt = new MyAssertNotNullTest();
		assertNotNull(msnt.getPropValue("key1"));
	}
}

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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.
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Purpose of garbage collection
The garbage collection process is to identify the objects which are no longer referenced or needed by a program so that their resources can be reclaimed and reused. These identified objects will be discarded.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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