student.java

Java与面向对象程序设计实验教学讲义.复数类的实现,复数类的复杂运算,身份证号码的分析,图形界面设计

import java.io.*;
public class Student implements Serializable
{
	private String id;		//学号
	private String name;		//姓名
	private int eng;		//英语成绩
	private int math;	        //数学成绩
	private int comp;               //计算机成绩
	private int sum;		//总成绩	
	//构造方法
	public Student(String id,String name,int eng,int math,int comp){
            this.id=id;
            this.name=name;
            this.eng=eng;
            this.math=math;
            this.comp=comp;
            sum();            //计算总成绩
	}
        public Student(Student s){		
            this.id=s.id;
            this.name=new String(s.name);
            this.eng=s.eng;
            this.math=s.math;
            this.comp=s.comp;		
            sum();            //计算总成绩
	}

	public void setId(String id){
            this.id=id;
	}
        public void setName(String name){
            this.name=name;
	}
	public void setEng(int eng){
            this.eng=eng;
            sum();            //计算总成绩
	}
	public void setMath(int math){
            this.math=math;
            sum();            //计算总成绩
	}
	public void setComp(int comp){
            this.comp=comp;
            sum();            //计算总成绩
	}    	
	public String getId(){
            return id;
	}
	public String getName(){
            return name;
	}
	public int getEng(){
            return eng;
	}
	public int getMath(){
            return math;
	}
	public int getComp(){
            return comp;
	}
        public int getSum(){
            return sum;
	}
	//计算总成绩
	void sum(){
            this.sum=eng+math+comp;
	}
        public String toString(){
            return getId() + "\t"+getName() + "\t"+getEng() + "\t"+getMath() +
"\t"+getComp() + "\t"+getSum();
	}
	//比较两个Student对象的值是否相等
	public boolean equals(Object x) { 
            if (this.getClass() != x.getClass()) return false;      
                Student b = (Student) x;     
            return (this.getId().equals(b.getId())); 
        }	
	//比较成绩大小,当前对象成绩比参数对象成绩大时返回1,相等时返回0,其它返回-1.
	public int compare(Student A){
            if(this.getSum()>A.getSum()) return 1;
            else if(this.getSum()==A.getSum()) return 0;
            else return -1;
	}	
}