writableundergraduate.java

此文件能系统的介绍Java初级知识

package reviewclass.abstractinterface;

import reviewclass.Student;

/**
 * 
 * @author Dahogn
 * @version 1.01
 * @since 2008.11.15 说明接口的使用方法，一个类可以实现多个接口
 */
public class WritableUndergraduate extends Student implements Writable,
		Displayable {
	private int level; // 1 for freshman, 2 for sophomore,

	// 3 for junior, or 4 for senior.

	public WritableUndergraduate() {
		super();
		level = 1;
	}

	public WritableUndergraduate(String initialName, int initialStudentNumber,
			int initialLevel) {
		super(initialName, initialStudentNumber);
		setLevel(initialLevel); // Checks 1 <= initialLevel <= 4
	}

	public String toString() {
		return ("Name: " + getName() + "\nStudent number: "
				+ getStudentNumber() + "\nLevel: " + getLevel());
	}

	/**
	 * 因为继承自Student，所以此处不定义writeOutput()方法也不会出错
	 */
	public void writeOutput() {
		super.writeOutput();
		System.out.println("Student Level: " + level);
	}
	public void writeOutput2() {
		super.writeOutput();
		System.out.println("writeOutput2");
		System.out.println("Student Level: " + level);
	}
	public boolean equals(WritableUndergraduate other) {
		return (super.equals(other) && (this.level == other.level));
	}

	public void reset(String newName, int newStudentNumber, int newLevel) {
		reset(newName, newStudentNumber);
		setLevel(newLevel); // Checks 1 <= newLevel <= 4
	}

	public int getLevel() {
		return level;
	}

	public void setLevel(int newLevel) {
		if ((1 <= newLevel) && (newLevel <= 4))
			level = newLevel;
		else {
			System.out.println("Illegal level!");
			System.exit(0);
		}
	}

	public void outputClassName() {
		System.out.println("WritableUndergraduate");
	}

}