Encapsulation examples

EncapsulationExample.java

package encapsulation;

public class EncapsulationExample {

	public int left = 9;
	public int right = 3;

	// Now consider this question: Is the value of right always going to be one-
	// third the value of left? It looks like it will, until you realize that
	// users of the Foo class don’t need to use the setLeft() method! They can
	// simply go straight to the instance variables and change them to any
	// arbitrary int value.
	public void setLeft(int leftNum) {
		left = leftNum;
		right = leftNum / 3;
	}
	// lots of complex test code here

}

EncapsulationTest2.java

package encapsulation;

public class EncapsulationTest2 {
	private String name;
	private String idNum;
	private int age;

	public int getAge() {
		return age;
	}

	public String getName() {
		return name;
	}

	public String getIdNum() {
		return idNum;
	}

	public void setAge(int newAge) {
		age = newAge;
	}

	public void setName(String newName) {
		name = newName;
	}

	public void setIdNum(String newId) {
		idNum = newId;
	}
		
}

Test2.java

package encapsulation;

public class Test2 {
	public static void main(String args[]) {
		EncapsulationTest2 encap = new EncapsulationTest2();
		encap.setName("James");
		encap.setAge(20);
		encap.setIdNum("12343ms");

		System.out.print("Name : " + encap.getName() + " Age : "
				+ encap.getAge());
	}
}