public class Test{
public Test(){
System.out.println("Hello Word");
}
public static void main(String[] args) {
new Test();
}
/**
* 运行结果
Hello Word
*/
}
public class Test{
public Test(String msg){
System.out.println("Hello "+msg);
}
public static void main(String[] args) {
new Test("China");
}
/**
* 运行结果
Hello China
*/
}原文：http://blog.csdn.net/ztt_1119/article/details/40736395