Java实现Package编译和访问

Java实现Package编译和访问

说明

1. 所有文件都是使用UTF-8编码来写的，请不要用Windows记事本随便打开
2. Test.java文件中注释的方法说明了该类是不能访问其方法的

文件目录树

• bin
  • Test1.class
  • Test2.class
  • Test3.class
• classes
  • X
    • Y
      • A.class
      • B.class
• lib
  • E.jar
    • S
      • T
        • C.class
        • D.class
• src
  • A.java
  • B.java
  • C.java
  • D.java
  • Test1.java
  • Test2.java
  • Test3.java
• Makefile

代码一览

/* A.java */
package X.Y;

import java.util.*;

public class A {

	public void sayPublic() {
		System.out.println("Hi, " + this.getClass() + ". (public)");
	}

	private void sayPrivate() {
		System.out.println("Hi, " + this.getClass() + ". (private)");
	}

	protected void sayProtected() {
		System.out.println("Hi, " + this.getClass() + ". (protected)");
	}

	void sayDefault() {
		System.out.println("Hi, " + this.getClass() + ". (default)");
	}
}

/* B.java */
package X.Y;

import java.util.*;

public class B {

	public void sayPublic() {
		System.out.println("Hi, " + this.getClass() + ". (public)");
	}

	private void sayPrivate() {
		System.out.println("Hi, " + this.getClass() + ". (private)");
	}

	protected void sayProtected() {
		System.out.println("Hi, " + this.getClass() + ". (protected)");
	}

	void sayDefault() {
		System.out.println("Hi, " + this.getClass() + ". (default)");
	}
}

/* C.java */
package S.T;

import java.util.*;

public class C {

	public void sayPublic() {
		System.out.println("Hi, " + this.getClass() + ". (public)");
	}

	private void sayPrivate() {
		System.out.println("Hi, " + this.getClass() + ". (private)");
	}

	protected void sayProtected() {
		System.out.println("Hi, " + this.getClass() + ". (protected)");
	}

	void sayDefault() {
		System.out.println("Hi, " + this.getClass() + ". (default)");
	}
}

/* D.java */
package S.T;

import java.util.*;

public class D {

	public void sayPublic() {
		System.out.println("Hi, " + this.getClass() + ". (public)");
	}

	private void sayPrivate() {
		System.out.println("Hi, " + this.getClass() + ". (private)");
	}

	protected void sayProtected() {
		System.out.println("Hi, " + this.getClass() + ". (protected)");
	}

	void sayDefault() {
		System.out.println("Hi, " + this.getClass() + ". (default)");
	}
}

/* Test1.java */
import java.util.*;
import X.Y.*;
import S.T.*;

class Test1 {
	public static void main(String[] args) {
		A a = new A();
		a.sayPublic();
		//a.sayPrivate();
		//a.sayProtected();
		//a.sayDefault();

		C c = new C();
		c.sayPublic();
		//c.sayPrivate();
		//c.sayProtected();
		//c.sayDefault();
	}
}

/* Test2.java */
import java.util.*;
import X.Y.*;
import S.T.*;

class Test2 extends B {
	public static void main(String[] args) {
		Test2 test2 = new Test2();
		test2.sayPublic();
		//test2.sayPrivate();
		test2.sayProtected();
		//test2.sayDefault();
	}
}

/* Test3.java */
import java.util.*;
import X.Y.*;
import S.T.*;

class Test3 extends D {
	public static void main(String[] args) {
		Test3 test3 = new Test3();
		test3.sayPublic();
		//test3.sayPrivate();
		test3.sayProtected();
		//test3.sayDefault();
	}
}

/* Makefile */
target:
	javac -encoding utf-8 ./src/A.java -d ./classes
	javac -encoding utf-8 ./src/B.java -d ./classes
	javac -encoding utf-8 ./src/C.java -d .
	javac -encoding utf-8 ./src/D.java -d .
	jar cvf ./lib/E.jar ./S/*
	rm -rf ./S
	javac -encoding utf-8 -classpath "./lib/E.jar;./classes;" ./src/Test1.java -d ./bin
	javac -encoding utf-8 -classpath "./lib/E.jar;./classes;" ./src/Test2.java -d ./bin
	javac -encoding utf-8 -classpath "./lib/E.jar;./classes;" ./src/Test3.java -d ./bin

run-Test1:
	java -classpath "./bin;./lib/E.jar;./classes;" Test1

run-Test2:
	java -classpath "./bin;./lib/E.jar;./classes;" Test2

run-Test3:
	java -classpath "./bin;./lib/E.jar;./classes;" Test3

clean:
	rm -rf ./bin/*.class
	rm -rf ./classes/*
	rm -rf ./lib/*.jar

样例代码

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