Java Class getDeclaredMethod() Method

The getDeclaredMethod() method of java Class class returns a method object representing the specified method declared inside the class or the interface of this class.

Syntax

public Method getDeclaredMethod(String name, Class<?>... parameterTypes)
  throws NoSuchMethodException,  SecurityException

Parameter

name - the name of the method

parameterTypes - the parameter array

Returns

Method object.

Throws

NoSuchMethodException , SecurityException

Example 1

import java.lang.reflect.*;
public class ClassgetDeclaredMethodExample1 {
   public static void main(String[] args) {
ClassgetDeclaredMethodExample1 obj = new ClassgetDeclaredMethodExample1();
      Class class1 = obj.getClass();
try {          
         // parameter type is null
         Method mthd = class1.getDeclaredMethod("showmethod", null);
         System.out.println("method  1 = " + mthd.toString()); 
         // method Integer
         Class[] arg = new Class[1];
         arg[0] = Integer.class;
         Method mthd1 = class1.getDeclaredMethod("showIntegermethod", arg);
         System.out.println("method 2 = " + mthd1.toString());
        Class[] arg2 = new Class[1];
         arg2[0] = float.class;
         Method mthd3 = class1.getDeclaredMethod("showFloatmethod", arg2);
           System.out.println("method 3 = " + mthd3.toString());
      } catch(NoSuchMethodException e) {
         System.out.println(e.toString());  //print the exceptio object e
      }
   }
   private Integer showmethod() {
      return 1;
   }
   public void showIntegermethod(Integer i) {
      this.i = i;
   }
    public void showFloatmethod(float i) {
      this.f = f;
   }
   public int i = 88655;
   float f=3;
}

Test it Now

Output:

method  1 = private java.lang.Integer ClassgetDeclaredMethodExample1.showmethod()
method 2 = public void ClassgetDeclaredMethodExample1.showIntegermethod(java.lang.Integer)
method 3 = public void ClassgetDeclaredMethodExample1.showFloatmethod(float)

Example 2

//import statements...

import java.lang.reflect.Method;

public class ClassgetDeclaredMethodExample2 {

    public static void main(String... args) throws NoSuchMethodException {
        Class<Sample1> obj = Sample1.class;
        
        Method mthd = obj.getDeclaredMethod("Method1");
        System.out.println(mthd);

        mthd = obj.getDeclaredMethod("Methodint", int.class);
        System.out.println(mthd);
    }

    private static class Sample1 {
        private void Method1() { }

        public void Methodint(int i) { }
    }
}

Test it Now

Output:

private void ClassgetDeclaredMethodExample2$Sample1.Method1()
public void ClassgetDeclaredMethodExample2$Sample1.Methodint(int)

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