foreign.java

java编程思想第四版习题答案

// TIJ4 chapter Access, Exercise 9, page 233
/* Create in access/local directory in your CLASSPATH:
* // access/local/PackagedClass.java
* package access.local;
*
* class PackagedClass {
*	public PackagedClass() {
*		System.out.println("Creating a packaged class");
*	}
* }
* // Then, in another directrory create the file below and explain why compiler
* generates error. Would making Foreign class part of access.local change anything?
*/

// access/foreign/Foreign.java
package access.foreign;
import access.local.*;

public class Foreign {
	public static void main(String[] args) {
		PackagedClass pc = new PackagedClass();
	}
}

/* Compiler error because: PackagedClass in not public, so no access outside of
* package. Moving Foreign to local would allow package access to PackagedClass.
*/