import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;


public class Main {

/**
* Invokes the methods of an object using the Reflection api.
*/
public void invokeMethodsUsingReflection() {

//Obtain the Class instance
Class computerClass = Computer.class;

//Get the methods
Method[] methods = computerClass.getDeclaredMethods();

//Create the object that we want to invoke the methods on
Computer computer = new Computer();

//Loop through the methods and invoke them
for (Method method : methods) {
Object result;
try {
//Call the method. Since none of them takes arguments we just
//pass an empty array as second parameter.
result = method.invoke(computer, new Object[0]);
} catch (IllegalArgumentException ex) {
ex.printStackTrace();
return;
} catch (InvocationTargetException ex) {
ex.printStackTrace();
return;
} catch (IllegalAccessException ex) {
ex.printStackTrace();
return;
}
System.out.println(method.getName() + ": " + result);
}
}


/**
* @param args the command line arguments
*/
public static void main(String[] args) {
new Main().invokeMethodsUsingReflection();
}


class Computer {

private String brand = "DELL";
private String type = "Laptop";
private int harddiskSize_GB = 300;
private boolean AntiVirusInstalled = true;

public String getBrand() {
return brand;
}

public String getType() {
return type;
}

public int getHarddiskSize_GB() {
return harddiskSize_GB;
}

public boolean isAntiVirusInstalled() {
return AntiVirusInstalled;
}
}
}




The output of the code above is:

getBrand: DELL
getHarddiskSize_GB: 300
isAntiVirusInstalled: true
getType: Laptop