【JAVA学习路-think in java】p78:重载+构造器

package pkg;

class Tree{//a class
	int h;
	
	//1st constructor:default
	Tree(){
		System.out.println("Planting a seeding...");
		h=0;
	}
	//2nd constructor
	Tree(int ih){
		h=ih;
		System.out.println("Creating a new tree that is "+h+" feet tall");
	}
	
	void info(){//a general function
		System.out.println("Tree is "+h+" feet tall");
	}
	void info(String s) {// the general function with OVERLOADed method
		System.out.println(s+"	Tree is "+h+" feet tall");
	}
}


public class p78 {
	public static void main(String[] args) {
		Object Tree;//NEEDed! but the book NOT have this declaration
		for (int i=0;i<10;i++) {
			Tree t=new Tree(i);// 2nd constructor
			
			t.info();
			t.info("Overloaded:");
			System.out.println(" ");
		}
		
		new Tree();//1st constructor
	}
	
}

OUTPUT:

Creating a new tree that is 0 feet tall
Tree is 0 feet tall
Overloaded:    Tree is 0 feet tall
 
Creating a new tree that is 1 feet tall
Tree is 1 feet tall
Overloaded:    Tree is 1 feet tall
 
Creating a new tree that is 2 feet tall
Tree is 2 feet tall
Overloaded:    Tree is 2 feet tall
 
Creating a new tree that is 3 feet tall
Tree is 3 feet tall
Overloaded:    Tree is 3 feet tall
 
Creating a new tree that is 4 feet tall
Tree is 4 feet tall
Overloaded:    Tree is 4 feet tall
 
Creating a new tree that is 5 feet tall
Tree is 5 feet tall
Overloaded:    Tree is 5 feet tall
 
Creating a new tree that is 6 feet tall
Tree is 6 feet tall
Overloaded:    Tree is 6 feet tall
 
Creating a new tree that is 7 feet tall
Tree is 7 feet tall
Overloaded:    Tree is 7 feet tall
 
Creating a new tree that is 8 feet tall
Tree is 8 feet tall
Overloaded:    Tree is 8 feet tall
 
Creating a new tree that is 9 feet tall
Tree is 9 feet tall
Overloaded:    Tree is 9 feet tall
 
Planting a seeding...
 

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转载自blog.csdn.net/Andrew_Zeng/article/details/103932539