这是我第一个Package 包相关类的测试例子,分为三部分:MainTest 、PackageSecond 和PackageSub
  1。MainTest
  路径:PackageTest\com\xzm\maintest
  package com.xzm.maintest; 
import com.xzm.pksub.*; import com.xzm.pksecond.*; 
public class Main { public static void main(String[] args) { PackageSecond second = new PackageSecond("I am in Main"); second.printvalue(); 
PackageSub sub = new PackageSub("I am in Main"); sub.printvalue(); 
System.exit(0); } }
  2。PackageSecond
  路径:PackageTest\com\xzm\pksecond
  package com.xzm.pksecond; 
public class PackageSecond { private String value; 
public PackageSecond(String s) { value = s; } 
public void printvalue() { System.out.println("value of PackageSecond is " + value); } }
  3。PackageSub
  路径:PackageTest\com\xzm\pksub
  package com.xzm.pksub; 
import com.xzm.pksecond.*; 
public class PackageSub { private String value; 
public PackageSub(String s) { value = s; } 
public void printvalue() { PackageSecond second = new PackageSecond("I am in subpackage."); second.printvalue(); 
System.out.println("value of PackageSub is " + value); } 
}
 
   
 
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