JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: Assertion method Assert.assertEquals() example.


Java Class: org.junit.Assert

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

Assert.assertEquals() methods checks that the two objects are equals or not. If they are not, an AssertionError without a message is thrown. Incase if both expected and actual values are null, then this method returns equal. In the below example, the first Test (mySimpleEqualsTest()) compares two strings. The second test (myObjectEqualsTest()) we are comparing two different user defined objects. The assertEquals() method calls equals method on each object to check equality.


package com.java2novice.junit.tests;

import org.junit.Test;

import com.java2novice.junit.samples.Employee;

import static org.junit.Assert.*;

public class MyAssertEqualsTest {

	@Test
	public void mySimpleEqualsTest(){
		
		String expectedName = "Nattu";
		assertEquals(expectedName, Employee.getEmpNameWithHighestSalary());
	}
	
	@Test
	public void myObjectEqualsTest(){
		
		Employee expectedEmpObj = new Employee(1, "Nattu", 15000);
		assertEquals(expectedEmpObj, Employee.getHighestPaidEmployee());
	}
}

package com.java2novice.junit.samples;

import java.util.ArrayList;
import java.util.List;

public class Employee {

	private String name;
	private int empId;
	private int salary;
	
	public Employee(int id, String name, int sal){
		this.empId = id;
		this.name = name;
		this.salary = sal;
	}
	
	public boolean equals(Object obj){
		Employee emp = (Employee) obj;
		boolean status = false;
		if(this.name.equalsIgnoreCase(emp.name)
				&& this.empId == emp.empId 
				&& this.salary == emp.salary){
			status = true;
		}
		return status;
	}
	
	public static String getEmpNameWithHighestSalary(){
		/**
		 * logic to get Highest paid employee
		 */
		return "Nattu";
	}
	
	public static Employee getHighestPaidEmployee(){
		/**
		 * hiding logic to get highest paid employee
		 */
		return new Employee(1, "Nattu", 15000);
	}
	
	public int hashCode(){
		return this.empId;
	}
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getEmpId() {
		return empId;
	}
	public void setEmpId(int empId) {
		this.empId = empId;
	}
	public int getSalary() {
		return salary;
	}
	public void setSalary(int salary) {
		this.salary = salary;
	}
}

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