AccessTest.java

class Test{
	int a;		//default access
	public int b;	//public  access
	private int c;	//private access

	//methods to access c
	void setc(int i)
	{
		c = i;
	}

	int getc()
	{
		return this.c;
	}

	void manipulate(int x, int y)
	{
		x +=10;
		y  *=10;
		System.out.println("x and y after manipulation in manipulate() method:  " + x + ",  " + y);
	}

	void manipulate(Test o)
	{
		o.a +=10;
		o.b  *=10;
		o.setc(50);
	}
}

class AccessTest{
	public static void main(String args[])
	{
		System.out.println();
		System.out.println("Showing difference between access specifiers");
		Test ob = new Test();

		ob.a = 10;		//a has default access so can be set directly using object
		ob.b = 20;		//b has public access so can be set directly using object
	                    //ob.c = 30;	//This will cause an ERROR as c has private access and can be accessed from outside of class only by using some default or public member of that class
 		//To test, just uncomment above statement and then compile it.

		//To set c, we have created a function setc();
		ob.setc(40);

		System.out.println("a, b and c :  " + ob.a + ",  " + ob.b  +  ",  " + ob.getc());

		System.out.println();
		System.out.println("Showing the effect of manipulation on a variable and a class object");
		System.out.println();
		System.out.println("Showing the effect of manipulation on variables ");

		int x = 10;
		int y = 20;
		System.out.println("x and y before manipulation:  " + x + ",  " + y);
		ob.manipulate(x,y);
		System.out.println("x and y after manipulation in main() method:  " + x + ",  " + y);

		System.out.println();

		Test ob1 = new Test();
		ob1.a = 20;
		ob1.b = 30;
		ob1.setc(100);
		System.out.println("Showing the effect of manipulation on a class object");
		System.out.println("a, b and c before manipulation:  " + ob1.a + ",  " + ob1.b  +  ",  " + ob1.getc());
		ob1.manipulate(ob1);
		System.out.println("a, b and c after manipulation:  " + ob1.a + ",  " + ob1.b  +  ",  " + ob1.getc());
	}
}