面向对象

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“==”用来比较基本数据类型的变量

“equals方法”比较两个对象中的内容是否一样

class Person
{
int age;
void shout()
{
  System.out.println("my age is"+age);
}
public static void main(String [] args)
{
       Person P1 = new Person();
       Person P2 = new Person();
       P1.age = -30;
       P1.shout();
       P2.shout();

       String str1 = new String("abc");
       String str2 = new String("abc");
       String str3 = str1;
       if(str1 == str2)
             System.out.println("true");
       else
             System.out.println("false");
}
}

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class Person
{
int age;
void shout()
{
  System.out.println("my age is"+age);
}
public static void main(String [] args)
{
       Person P1 = new Person();
       Person P2 = new Person();
       P1.age = -30;
       P1.shout();
       P2.shout();

       String str1 = new String("abc");
       String str2 = new String("abc");
       String str3 = str1；
       if(str1.equals(str2))
             System.out.println("true");
       else
             System.out.println("false");
}
}