java 面向对象 this 构造函数 垃圾回收
2016-06-21 15:56
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import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class Test {
private int age ;
private String name;
public void shout() {
System.out.println("年龄"+age);
}
public int getAge() {
return age;
}
public String getName() {
return name;
}
public void setAge(int age) {
if(age < 0)
return;
this.age = age;
}
public void finalize() {
System.out.println("垃圾回收");
}
public void setName(String name) {
this.name = name;
}
public Test() {
}
public Test(int age) {
this.age = age;
}
public Test(int age,String name) {
/*this.age = age;*/
this(age);//调用 Test(int age) 构造方法
this.name = name;
}
public void getSomeOne(Test t){
System.out.println("getSomeOne");
t.shout();
}
public void fun1(){
System.out.println(name);
}
public void fun2(){
Test a2 = new Test(70, "李四");
a2.fun1();
fun1();
System.out.println(this.name);
}
public static void main(String[] args) {
Test t1 = new Test();
Test t2 = new Test(10, "李四");
Test t3 = new Test(20, "张三");
t2.setAge(-10);
t1.shout();
t2.getSomeOne(t1);//T2访问t1的成员变量
t1.fun2();
System.out.println(t1.age+t1.name+" "+t2.age+t2.name+" "+t3.age+t3.name);
new Test();
new Test();
new Test();
System.gc();
}
}
打印结果:
年龄0
getSomeOne
年龄0
李四
null
null
0null 10李四 20张三
垃圾回收
垃圾回收
垃圾回收
垃圾回收
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class Test {
private int age ;
private String name;
public void shout() {
System.out.println("年龄"+age);
}
public int getAge() {
return age;
}
public String getName() {
return name;
}
public void setAge(int age) {
if(age < 0)
return;
this.age = age;
}
public void finalize() {
System.out.println("垃圾回收");
}
public void setName(String name) {
this.name = name;
}
public Test() {
}
public Test(int age) {
this.age = age;
}
public Test(int age,String name) {
/*this.age = age;*/
this(age);//调用 Test(int age) 构造方法
this.name = name;
}
public void getSomeOne(Test t){
System.out.println("getSomeOne");
t.shout();
}
public void fun1(){
System.out.println(name);
}
public void fun2(){
Test a2 = new Test(70, "李四");
a2.fun1();
fun1();
System.out.println(this.name);
}
public static void main(String[] args) {
Test t1 = new Test();
Test t2 = new Test(10, "李四");
Test t3 = new Test(20, "张三");
t2.setAge(-10);
t1.shout();
t2.getSomeOne(t1);//T2访问t1的成员变量
t1.fun2();
System.out.println(t1.age+t1.name+" "+t2.age+t2.name+" "+t3.age+t3.name);
new Test();
new Test();
new Test();
System.gc();
}
}
打印结果:
年龄0
getSomeOne
年龄0
李四
null
null
0null 10李四 20张三
垃圾回收
垃圾回收
垃圾回收
垃圾回收
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