变量的比较

/*变量的比较
 * 1.==用于比较两个基础数据类型时只比较字节组合
 *   ==用于比较对象类型时只比较两个对象是否指向同一对象
 * 2.equals()方法用于比较两个对象的实际意义是否相等*/

class XDog{
    private int size;
    private String name;
    XDog(String name,int size){
        this.name = name;
        this.size = size;
    }
    XDog dog1 = new XDog("旺财",100);
    XDog dog2 = new XDog("大王",100);
    public void bark(){
        if(dog1.equals(dog2)){
            System.out.println("dog1与dog2意义相等");
        }
    }
    //dog1.equals(dog2)true;
    
    
}
public class Bianliangbijiao {
    public static void main(String[]  args){    
          int a = 3;
          byte b = 3;
          if(a == b){
              System.out.println("a与b相等");}
          
          
          
          
          Bianliangbijiao foo1 = new Bianliangbijiao();
          Bianliangbijiao foo2 = new Bianliangbijiao();
          Bianliangbijiao foo3 =foo1;
          
          if(foo1 == foo2){
              System.out.println("foo1和foo2是指向同一个对象的！");
          }else{
              System.out.println("foo1和foo2是指向不同的对象");
          }
          
          if(foo1.equals(foo2)){
              System.out.println("foo1和foo2是真的相同！");
          }else{
              System.out.println("foo1和foo2是真的不相同");
          }
          if(foo1 == foo3){
              System.out.println("foo1和foo3是指向同一个对象的！");
          }else{
              System.out.println("foo1和foo3是指向不同的对象");
          }
      }
}