The Third Class

Java课渐入正轨

package ThirdClass;

public class Test1 {
    //类：类成员变量，类成员方法
    //对象：声明、创建、调用
    public static void main(String[] args) {
        Student student = new Student("于伟安","男",891);
        System.out.println(student.getName() + " " + student.getSex() + " 学号：" + student.getID());
        student.setName("小石榴yyds");
        student.setSex("男");
        student.setID(100);
        System.out.println(student.getName() + " " + student.getSex() + " 学号：" + student.getID());
    }
}
class Student{
    private String name;
    private String sex;
    private int ID;
    public Student(String s1,String s2,int i)
    {
        name = s1;
        sex = s2;
        ID = i;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public int getID() {
        return ID;
    }

    public void setID(int ID) {
        this.ID = ID;
    }
}

package ThirdClass;

public class Test2 {
    public static void main(String[] args) {
        Time time = new Time(23,10,32);
        System.out.println(time.toUniversalString());
        System.out.println(time.toString());

        time.setHour(1);
        time.setMinute(45);
        time.setSecond(12);

        System.out.println(time.toUniversalString());
        System.out.println(time.toString());
    }
}
class Time{
    private int hour;
    private int minute;
    private int second;
    public Time(int h,int m,int s){
        setHour(h);
        setMinute(m);
        setSecond(s);
    }

    public void setHour(int hour){
        this.hour = ( hour>24||hour<0 ? 0 : hour );
    }
    public int getHour(){
       return this.hour;
    }

    public void setMinute(int minute){
        this.minute = ( minute>60||minute<0 ? 0 : minute);
    }
    public int getMinute(){
        return this.minute;
    }

    public void setSecond(int second){
        this.second = ( second>60||second<0 ? 0 : second);
    }
    public int getSecond(){
        return this.second;
    }

    //重写toString方法
    //format十分类似C语言里的scanf
    //通用显示格式：HH:MM:SS
    public String toUniversalString(){
        return String.format("%02d:%02d:%02d", getHour(), getMinute(), getSecond());
    }
    //标准显示格式：H:MM:SS AM/PM
    public String toString(){
        return String.format( "%d:%02d:%02d %s", ((getHour() == 0 || getHour() == 12) ? 12 : getHour() % 12 ),
                getMinute(), getSecond(), ( getHour() < 12 ? "AM" : "PM" ) );
        }
}