writableundergraduate2.java

来自「此文件能系统的介绍Java初级知识」· Java 代码 · 共 44 行

package reviewclass.abstractinterface;

/**
 * 
 * @author Dahogn
 * @version 1.01
 * @since 2008.11.15 说明接口的使用方法
 */
public class WritableUndergraduate2 extends WriteClass {
	private int level; // 1 for freshman, 2 for sophomore,

	// 3 for junior, or 4 for senior.

	public WritableUndergraduate2() {
		super();
		level = 1;
	}

	/**
	 * 因为继承自Student，所以此处不定义writeOutput()方法也不会出错
	 */
	public void writeOutput() {
		System.out.println("Student Level: " + level);
	}

	public boolean equals(WritableUndergraduate2 other) {
		return (super.equals(other) && (this.level == other.level));
	}

	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);
		}
	}

}