Android方法的传递值及其改变

MainActivity如下:

[java]
package cn.testchangevar;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.app.Activity;
/**
* Demo描述:
* Java中的传值及其改变
*
*/
public class MainActivity extends Activity {
    private int id=7;
    private Person mPerson;
    private Button mButton;
    private String mString;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        init();
    }
   private void init(){
        mString=new String("OOOOO");
        mPerson=new Person("xx", 22);
        mButton=(Button) findViewById(R.id.button);
        mButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                System.out.println("111 id="+id);
                System.out.println("111 mString="+mString);
                System.out.println("111 mPerson.getAge()="+mPerson.getAge());
                System.out.println("=========================");
                Util.change(id);
                Util.change(mString);
                Util.change(mPerson);
                System.out.println("=========================");
                System.out.println("222 id="+id);
                System.out.println("222 mString="+mString);
                System.out.println("222 mPerson.getAge()="+mPerson.getAge());
            }
        });
   }
}

package cn.testchangevar;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.app.Activity;
/**
* Demo描述:
* Java中的传值及其改变
*
*/
public class MainActivity extends Activity {
private int id=7;
private Person mPerson;
    private Button mButton;
    private String mString;
@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  init();
}
   private void init(){
     mString=new String("OOOOO");
     mPerson=new Person("xx", 22);
     mButton=(Button) findViewById(R.id.button);
     mButton.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View view) {
    System.out.println("111 id="+id);
    System.out.println("111 mString="+mString);
    System.out.println("111 mPerson.getAge()="+mPerson.getAge());
    System.out.println("=========================");
    Util.change(id);
    Util.change(mString);
    Util.change(mPerson);
    System.out.println("=========================");
    System.out.println("222 id="+id);
    System.out.println("222 mString="+mString);
    System.out.println("222 mPerson.getAge()="+mPerson.getAge());
   }
  });
   }
}

Util如下:

[java]
package cn.testchangevar;

public class Util {
   //不可以改变.因为int属于基础类型
   public static void change(int i){
       i=9527;
       System.out.println("has been changed i="+i);
   }

   //可以改变.传递的是对象
   public static void change(Person person){
       person.setAge(88);
       System.out.println("has been changed string="+person);
   }

   //不可以改变.虽然String也是对象,但是较为特殊
   public static void change(String string){
       string="XXXXX";
       System.out.println("has been changed string="+string);
   }
}

package cn.testchangevar;

public class Util {
   //不可以改变.因为int属于基础类型
   public static void change(int i){
    i=9527;
    System.out.println("has been changed i="+i);
   }

   //可以改变.传递的是对象
   public static void change(Person person){
    person.setAge(88);
    System.out.println("has been changed string="+person);
   }

   //不可以改变.虽然String也是对象,但是较为特殊
   public static void change(String string){
    string="XXXXX";
    System.out.println("has been changed string="+string);
   }
}

Person如下:

[java]
package cn.testchangevar;

public class Person {
    private String name;
    private int age;
    public Person(String na

补充：移动开发 , Android ,