original.java

java实例 本实例是初学java的人全程学习的很好辅助材料,从最简单的入门至后面可以自己开发出一个应用程序出来

package p1;

public class Original{
	int n_friendly = 1;
	private int n_private = 2;
	protected int n_protected = 3;
	public int n_public = 4;
	void Access( ){
		System.out.println("**** In same class, you can access ...");
		System.out.println("friendly member "+n_friendly);
		System.out.println("private member "+n_private);
		System.out.println("protected member "+n_protected);
		System.out.println("public member "+n_public);
	}
}

class Derived extends Original{
	void Access( ){
		System.out.println("**** 相同包的子类 ****");
		System.out.println("friendly member "+n_friendly);
		// System.out.println("private member "+n_private);  //不能访问
		System.out.println("protected member "+n_protected);
		System.out.println("public member "+n_public);
		
		Original o = new Original( );
		System.out.println("****  相同包的子类的其他对象 ****");
		System.out.println("friendly member "+o.n_friendly);
		// System.out.println("private member "+o.n_private); //不能访问
		System.out.println("protected member "+o.n_protected);
		System.out.println("public member "+o.n_public);
	}
}

class SamePackageClass{
	void Access( ){
		Original o = new Original( );
		System.out.println("**** 相同包的其他类 ****");
		System.out.println("friendly member "+o.n_friendly);
		// System.out.println("private member "+o.n_private);//不能访问
		System.out.println("protected member "+o.n_protected);
		System.out.println("public member "+o.n_public);
	}
}

class AccessControl{
	public static void main( String args[ ] ){
		Original o = new Original( );
		o.Access( );
		Derived d = new Derived( );
		d.Access( );
		SamePackageClass s = new SamePackageClass( );
		s.Access( );
	}
}