方法类 | Java中的equals()方法

Method 类的Java.lang.reflect.Method.equals(Object obj)方法将此 Method Object 与指定对象作为参数进行比较，作为 equal(object obj) 方法的参数。如果 Method 对象与传递的对象相同，则此方法返回 true。如果两个方法由同一个类声明并且具有相同的名称和形参类型和返回类型，则它们是相同的。

句法：

public boolean equals(Object obj)

参数：此方法接受一个强制参数obj ，它是要比较的对象。

返回值：如果 Method 对象与作为参数传递的对象相同，则方法返回true ，否则返回false 。

下面的程序说明了 Method 类的 equals(Object obj) 方法：

示例 1：当两个对象相同时。

/*
* Program Demonstrate equals(Object Obj)
* method of Method Class.
*/
import java.lang.reflect.Method;
  
public class GFG {
  
    public static void main(String[] args)
        throws NoSuchMethodException,
               SecurityException,
               ClassNotFoundException
    {
  
        // Get all method of class GFGClass
        // and store in an Array of Method Objects
        Method[] methods = GFGClass.class.getMethods();
  
        // create a method object by passing
        // method name and parameter type
        Method method = GFGClass.class
                            .getMethod("add", String.class);
  
        System.out.println("First Method object from array "
                           + "create by getMethods():");
        System.out.println(methods[0]);
        System.out.println("Method object created by "
                           + "getMethod():");
        System.out.println(method);
  
        // compare both objects by equals method
        if (methods[0].equals(method)) {
            System.out.println("Both Method objects"
                               + " are equal");
        }
        else {
            System.out.println("Both Method objects"
                               + " are not equal");
        }
    }
}
  
// This is Sample Class for which
// the class object are created
class GFGClass {
  
    // We have two variables in this class
  
    private String field1;
  
    public GFGClass()
    {
    }
  
    // creatin methods
    public String add(String field2)
    {
        return this.field1 + field2;
    }
}

输出：

First Method object from array create by getMethods():
public java.lang.String GFGClass.add(java.lang.String)
Method object created by getMethod():
public java.lang.String GFGClass.add(java.lang.String)
Both Method objects are equal

示例 2：当两个对象不相同时。

/*
* Program Demonstrate equals(Object Obj) method of Method Class.
*/
import java.lang.reflect.Method;
  
// This is Main Class
public class GFG {
  
    public static void main(String[] args)
    {
  
        // Get all method of class GFGClass
        // and store as Array of Method Objects
        Method[] methods = GFGClass.class.getMethods();
  
        // select any two method and compare
        System.out.println("Methods are :");
        System.out.println(methods[0]);
        System.out.println(methods[1]);
        if (methods[0].equals(methods[1])) {
            System.out.println("Methods are equal");
        }
        else {
            System.out.println("Methods are not equal");
        }
    }
}
  
// This is Sample Class
class GFGClass {
  
    // We have two variables in this class
    private String field1;
    private String field2;
  
    public GFGClass()
    {
    }
  
    // we have four methods in this class
    public String getField1()
    {
        return field1;
    }
  
    public void setField1(String field1)
    {
        this.field1 = field1;
    }
  
    public String getField2()
    {
        return field2;
    }
  
    public void setField2(String field2)
    {
        this.field2 = field2;
    }
}

输出：

Methods are :
public java.lang.String GFGClass.getField1()
public void GFGClass.setField1(java.lang.String)
Methods are not equal

参考：
https://docs.oracle.com/javase/8/docs/api/java Java