Ten years Hello World,actually writing is life

 

 

本文系投稿，作者：林杰。

作者寄语：十年hello world，写的是人生，每一段代码代表每一年和人生的过程。

 

//LinJie
//Ten years Hello world，actually writing is life !
//Original

//First year
public class LinJie{
  public static void main(String[] args) {
    //hello world
    System.out.println("hello world");
  }
}

//Second years
public class LinJie{
  public static void main(String[] args) {
    //hello world
    LinJie obj = new LinJie();
    obj.toString();
  }

  /* (non-Javadoc)
   * @see java.lang.Object#toString()
   */
  @Override
  public String toString() {
    return "hello world";
  }
}

//The third year
public class LinJie{
  private static LinJie instance;
  public static LinJie getInstance() {
    if(instance == null)
      instance = new LinJie();
    return instance;
  }
  /* (non-Javadoc)
   * @see java.lang.Object#toString()
   */
  @Override
  public String toString() {
    return "hello world";
  }
  
  public static void main(String[] args) {
    //hello world
    LinJie obj = LinJie.getInstance();
    obj.toString();
  }
}

//Fourth years
public class LinJie{
  private final String a; //required
  private final String b; //required
  
  private final String c; //optional
  private final String d; //optional
  
  //Builder
  public static class Builder{
    //required
    private final String a;
    private final String b;
    //optional
    private String c;
    private String d;
    
    public Builder(String a,String b) {
      this.a = a;
      this.b = b;
    }
    public Builder c(String val)
      { c = val; return this; }
    public Builder d(String val)
      { d = val; return this; }
    
    public LinJie build() {
      return new LinJie(this);
    }
  }
  
  private LinJie(Builder builder) {
    a = builder.a;
    b = builder.b;
    c = builder.c;
    d = builder.d;
  }

  /* (non-Javadoc)
   * @see java.lang.Object#toString()
   */
  @Override
  public String toString() {
    return c+" "+d;
  }
  
  public static void main(String[] args) {
    //hello world
    LinJie obj = new LinJie.Builder("lin", "jie").
        c("hello").d("world").build();
    System.out.println(obj.toString());
  }
}

//Fifth years
/*
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">
  <bean id="linjie" class="com.linjie.LinJie"></bean>
</beans>
*/
public class LinJie{
  @Test
  public void test() {
    //hello world
    ApplicationContext context = new ClassPathXmlApplicationContext
                ("applicationContext.xml");
    LinJie obj = (LinJie) context.getBean("linjie");
    obj.hello_world();
  }
  public void hello_world() {
    System.out.println("hello world");
  }
}

//Sixth years
/*
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
     http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.0.xsd">
    <!-- 扫描 -->
  <context:component-scan base-package="com.linjie.aop">
    </context:component-scan>   
</beans>
*/
@Component("linjie")
public class LinJie{
  @Test
  public void test() {
    //hello world
    ApplicationContext context = new ClassPathXmlApplicationContext
                ("applicationContext.xml");
    LinJie obj = (LinJie) context.getBean("linjie");
    obj.hello_world();
  }
  public void hello_world() {
    System.out.println("hello world");
  }
}

//Seventh years
/*
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
     http://www.springframework.org/schema/beans/spring-beans.xsd
     http://www.springframework.org/schema/aop
     http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
     http://www.springframework.org/schema/context
     http://www.springframework.org/schema/context/spring-context-4.0.xsd">
  <context:component-scan base-package="com.linjie.aop">
    </context:component-scan>   
  <aop:aspectj-autoproxy></aop:aspectj-autoproxy>   
</beans>
*/
/*
@Component("arithmetic")
public class Arithmetic {
  public void hello_world() {}
}
 */
@Aspect
@Component("linjie")
public class LinJie{
  @Test
  public void test() {
    //hello world
    ApplicationContext context = new ClassPathXmlApplicationContext
                ("applicationContext.xml");
    LinJie obj = (LinJie) context.getBean("linjie");
    obj.hello_world();
  }
  @Before("execution(* com.linjie.aop.Arithmetic.*(..))")
  public void Before_Loggin() {
    System.out.println("hello world");
  }
}

//Eighth years fail

//Ninth years fail

//Tenth years
public class LinJie {
  public static void main(String[] args) {
    String grow       = "hello world";
    String grow_up    = "hello world";
    String grow_up_up = "hello world";
    if(grow.equals(grow_up) && grow.equals(grow_up_up))
      System.out.println(grow);
  }
}