Java 中的方法类| equals()方法
原文:https://www . geesforgeks . org/method-class-equals-method-in-Java/
语法:
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:如果方法对象与作为参数传递的对象相同，则方法返回真，否则返回假。
下面的程序说明了方法类的 equals(对象对象)方法:
例 1: 当两个物体相同时。
/*
* 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;
}
}
Output:
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: 当两个物体不同时。
/*
* 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;
}
}
Output:
Methods are :
public java.lang.String GFGClass.getField1()
public void GFGClass.setField1(java.lang.String)
Methods are not equal
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