package first;

import java.nio.charset.MalformedInputException;

this
1
    public class Studen {
        int age; // 年齡
        String name; // 姓名
        String position; // 職位
        String education; // 學歷

        public Studen(int age, String name, String position, String education) {
            super();
            this
 
.age = age;
            this.name = name;
            this.position = position;
            this.education = education;
        }
        public void print() {
            name = "小王";
        }
        public static void main(String[] args) {
            Studen problem=new Studen(13,"xiaoming","teacher"
 
,"博士");
            System.out.println(problem.name);
            problem.print();
            System.out.println(problem.name);
        }
    }

2
public class Studen {

    String name="xiao";

    void doHomework(){
        System.out.println(this.name+"正在做作業.......");
    }

    void speak(){
        new
 
 Studen().doHomework();//學生B，換為this.dohomework()則為學生A
        System.out.println(name+"正在說話......");//學生A
    }

    public static void main(String[] args) {
        Studen student = new Studen();
        student.speak();//學生A
    }
}