overloading.java

JAVA编程思想第四版英文原版习题答案. pdf原版的

// object/Overloading.java
// TIJ4 Chapter Object, Exercise 16, page 91
/* In the Initialization and Cleanup chapter, locate the Overloading.java
* example and add Javadoc documentation. Extract this comment documentation
* into and HTML file using Javadoc and view it with your Web browser.
*/

// initialization/Overloading.java
// Demonstration of both constructor
// and ordinary method overloading.

/** creates type Tree wth two constructors and one info method
*/

class Tree {
	int height;
	
	/** no-argument constructor
	* assigns height = 0
	*/

	Tree() {
		System.out.println("Planting a seedling");
		height = 0;
	}

	/** constructor taking an int argument,
	* assigns height that int argument
	*/

	Tree(int initialHeight) {
		height = initialHeight;
		System.out.println("Creating new tree that is " + height + " feet tall");
	}

	/** method to print height of tree object
	*/
	
	void info() {
		System.out.println("Tree is " + height + " feet tall");
	}

	/** overloaded method to print string argument 
	* and height of a tree object
	*/

	void info(String s) {
		System.out.println(s + ": Tree is " + height + " feet tall");
	}
}

/** class to test construction of tree objects
*/

public class Overloading {
	public static void main(String[] args) {
		for(int i = 0; i < 5; i++) {
			Tree t = new Tree(i);
			t.info();
			t.info("overloading method");
		}
		// Overloaded constructor:
		new Tree();
	}
}