【JAVA学习路-think in java】p114：多个类库中相同存在相同类

package pkg;
// learn about Random
import java.util.*;

public class p42 {
	
	public static void main(String[] args) {
		
		Random ran=new Random(914);
		System.out.println("ran="+ran);
		int i=ran.nextInt(20);
		int j=ran.nextInt(100);
		int k=ran.nextInt(100000);
		
		System.out.println("i="+i);
		System.out.println("j="+j);
		System.out.println("k="+k);
		
	}
	
	
}


//----------------------------------------
package pkg2;

public class p42 {
	public static void main() {
		System.out.println("this is another p42 class but in pkg2");
	}
}


//----------------------------------------
package pkg3;

import pkg.*;
import pkg2.*;

public class test {
	
	public static void main(String[] args) {
		
		p42 obj=new p42();	// ambiguous ERROR
	}
	
}

output:

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
    The type p42 is ambiguous
    The type p42 is ambiguous

    at pkg3.test.main(test.java:10)