this

package mypro01;

public class Teacher {
    
    
    String name;
    int id;
    
    //构造方法中，this总是指向正要初始化的对象；
    
    public Teacher(String name) {
        this.name = name;
        System.out.println(this.name+" is a teacher");
    }
    
    public void setName(String name) {
        this.name=name;
    }
    
    //普通方法中，this总是指向调用该方法的对象；
    public void teach() {
        System.out.println(this.name+" is teaching");
    }
    
    public static void main(String[] args) {
        Teacher t = new Teacher("wang");//wang is a teacher
        t.setName("qiao");
        t.teach();  //qiao is teaching
    }  
      
  }