題目：建立一個Person類，宣告屬性和行為，在測試類中例項化物件，並通過呼叫物件的方法列印以下內容：
“小王是一個男胖子，體重200.0kg。某天他開始減肥，經過不懈努力，減了40kg。減肥後的體重是160.0kg。”

Person類：
public class Person {
    private String name;
    private char sex;
    private double weight;



    public void jf(double i){
        String s = "他";
        if(sex == '女'){
            s = "她"
 
;
        }
        System.out.println(name+"是一個"+sex+"胖子,體重"+this.weight+"kg。某天他開始減肥，經過不懈努力，減了"+i+"kg。減肥後的體重是"+(weight-i)+"kg。");
    }


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
    public char getSex() {
        return
 
 sex;
    }

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

    public double getWeight() {
        return weight;
    }

    public void setWeight(double weight) {
        this.weight = weight;
    }


    public Person(String name, char sex, double weight) {       
        this.name = name;
        this
 
.sex = sex;
        this.weight = weight;
    }


    public Person() {

    }



}

Test類：
public class Test {
    public static void main(String[] args) {
        /*Person p = new Person();
        p.setName("小王");
        p.setWeight(200.0);
        p.setSex('男');*/
        Person p = new Person("小王",'男',200.0);
        p.jf(40);
    }

}