java中this的n种使用方法

public class DebugerTest {
 public static void main(String[] args) {
  UserExample samp1 = new UserExample("amy");
  System.out.println("who are u? ");
  System.out.println(samp1.whoAreU());
  System.out.println("intro yourself?");
  System.out.println(samp1.introYourself());
 }
}
class UserExample {
 private String name;
 private Integer age;
 private MyDoll myDoll;
 public UserExample() {
  this(null);
 }
 // 3. 调用本类的其他构造方法
 public UserExample(String name) {
  this(name, -1);
 }
 public UserExample(String name, Integer age) {
  this.name = name;
  this.age = age;
  this.myDoll = new MyDoll("prize");
 }
 // 2. 调用本类属性
 public void changeMyName(String name) {
  this.name = name;
 }
 public void changeMyAge(Integer age) {
  this.age = age;
 }
 public String whoAreU() {
  return "I am " + name + ". ";
 }
 public String haoOldAreU() {
  return "i am " + age + " old.";
 }
 // 1. 调用本类方法
 public String introYourself() {
  return this.whoAreU() +
    this.haoOldAreU() +
    "rn whoAmI@ " + this.myDoll.whoAmI() +
    "rn whoAreSuper@ " + this.myDoll.whoAreSuper();
 }
 class MyDoll {
  private String name;
  public MyDoll(String name) {
   this.name = name;
  }
  public void changeMyName(String name) {
   this.name = name;
  }
  // 5. 隐藏式的调用
  public String whoAmI() {
   return whoAreU();
  }
  public String whoAreU() {
   return "I am a Doll, my name is " + name + ". ";
  }
  // 4. 调用父类的或指定的其他的类的同名方法
  public String whoAreSuper() {
   return "super is " + UserExample.this.whoAreU() + ". ";
  }
 }
}

 public String introYourself() {
  return this.whoAreU() + this.haoOldAreU();
 }

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

 public UserExample(String name) {
  this(name, -1);
 }

  public String whoAreSuper() {
   return "super is " + UserExample.this.whoAreU() + ". ";
  }

public String whoAmI() {
   return whoAreU();
  }