类的类getMethod()方法 (Class class getMethod() method)

• getMethod() method is available in java.lang package.

  getMethod()方法在java.lang包中可用。

• getMethod() method is used to return Method objects that indicate the given public method of the class or an interface denoted by this Class object.

  getMethod()方法用于返回表示类的给定公共方法或由此Class对象表示的接口的Method对象。

• getMethod() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  getMethod()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• getMethod() method may throw an exception at the time of returning a Method object.

  getMethod()方法在返回Method对象时可能会引发异常。

  • NoSuchMethodException: In this exception when a specifying method does not exist.NoSuchMethodException ：在此异常中，当指定方法不存在时。
  • SecurityException: In this exception, it may raise when the security manager exists.SecurityException ：在此异常中，当安全管理器存在时可能会引发此异常。
  • NullPointerException: In this exception when the given Method name is null.NullPointerException ：在此异常中，当给定的Method名称为null时。

Syntax:

句法：

public Method getMethod (String method_name, Class ...paramType);

Parameter(s):

参数：

• String method_name – represents the name of the method.

  字符串method_name –表示方法的名称。

• Class ...paramType – represents the parameter array of Class type.

  Class ... paramType –表示Class类型的参数数组。

Return value:

返回值：

The return type of this method is Method, it returns the Method object of this Class meets the given method_name and parameter array paramType.

此方法的返回类型为Method ，它返回满足给定method_name和参数数组paramType的该Class的Method对象。

Example:

例：

// Java program to demonstrate the example // of Method getMethod (String method_name, Class ...paramType) // method of Class import java.lang.reflect.*;public class GetMethodOfClass {
       public static void main(String[] args) throws Exception {
           String str = new String();        GetMethodOfClass dc = new GetMethodOfClass();        // Get Class object of String        Class cl = str.getClass();        // Get Class object of GetMethodOfClass        Class dm = dc.getClass();        // Calling No argument Method        Method no_argument_method = cl.getMethod("length", null);        System.out.println(" String Method = " + no_argument_method.toString());        Class[] method_arguments = new Class[2];        method_arguments[0] = Integer.class;        method_arguments[1] = Float.class;        // Calling argument Method        Method argument_method = dm.getMethod("argumentMethod: ", method_arguments);        System.out.println("This Class Method = " + argument_method.toString());    }    public void argumentMethod(Integer i, Float f) {
           this.i = i;        this.f = f;    }    public int i = 10;    private float f = 10.2f;}

Output

输出量

String Method = public int java.lang.String.length()This Class Method = public void GetMethodOfClass.argumentMethod(java.lang.Integer,java.lang.Float)

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