student.java

清华大学第二版

public class Student{
	String name;
	int age;

	public Student(String s, int n){
		name = s;
		age  = n;
	}
	public Student(String s){
		this(s, 20);
	}
	public Student(){
		this("Unknown");
	}
	
	
	public static void main(String args[]){
		
		
		Student s1=new Student( );
		
		System.out.println( s1.name + "  " +  s1.age);
	
	}
	
}












		
/*
myAccount = new BankAccount();
myAccount.ownerName = "Wangli" ;
myAccount.accountNumber = 1000234;
myAccount.balance = 2000.00f;
 */