Java中的方法类| equals（）方法-yiteyi-C++库

这个 JAVA朗，反思方法等于（对象obj） method类的method将此方法对象与指定的对象作为参数进行比较以获得相等（Object obj）方法。如果方法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、形式参数类型和返回类型，则它们是相同的。

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语法：

public boolean equals(Object obj)

参数： 此方法接受一个强制参数 obj 这是要比较的对象。

返回值： 方法返回 符合事实的 如果方法对象与作为参数传递的对象相同，则为 错误的 .

下面的程序演示了方法类的equals（Object obj）方法：

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

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/lang/reflect/Method.html#equals-爪哇。lang.反对-

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