Get/Set a bean property

This is an example of how to get and set a bean property. We are using theStatement class.
A Statement object represents a primitive statement in which a single method is applied to a target and a set of arguments. In order to get and set a bean property you should:

Create a simple class,like

Bean

class in the example. It has two String properties and getters and
setters for the properties.
Create a new object of

Bean

class.
Create a new Statement object
for the specified object to invoke the

setProperty1

method and by a String array of arguments.
Call the

execute()

API method of Statement. It finds a method whose name is the same as the

methodName

property,
and invokes the method on the Bean object.
Create a new Expression.
An Expression object represents a primitive expression in which a single method is applied to a target and a set of arguments to return a result. The new Expression is created with the specified value for the specified

Bean

object
to invoke the

getProperty1

method by the array of arguments.
Call

execute()

API method of Expression. It finds a method whose name is the same as the

methodName

property,
and invokes the method on the

Bean

object.
Call

getValue()

API method of Expression to get the value of the property set in the Expression.

Let’s take a look at the code snippet that follows:

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source

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01	package com.javacodegeeks.snippets.core;

02

03	import java.beans.Expression;

04	import java.beans.Statement;

05

06	public class GetSetBeanProperty {

07

08	public static void main(String[] args) throws Exception {

09

10	Object o = new Bean();

11

12	Statement stmt;

13	Expression expr;

14

15	// Set the value of property1

16	stmt = new Statement(o, "setProperty1" , new Object[]{ "My Prop Value" });

17	stmt.execute();

18

19	// Get the value of property1

20	expr = new Expression(o, "getProperty1" , new Object[ 0 ]);

21	expr.execute();

22	System.out.println( "Property1 value: " + (String)expr.getValue());

23

24	/////////////////////////////////////////////

25

26	// Set the value of property2

27	stmt = new Statement(o, "setProperty2" , new Object[]{ new Integer( 345 )});

28	stmt.execute();

29

30	// Get the value of property2

31	expr = new Expression(o, "getProperty2" , new Object[ 0 ]);

32	expr.execute();

33	System.out.println( "Property2 value: " + (Integer)expr.getValue());

34

35

}

36

37	public static class Bean {

38

39	// Property property1

40	private String property1;

41	// Property property2

42	private int property2;

43

44	public String getProperty1() {

45	return property1;

46

}

47	public void setProperty1(String property1) {

48	this .property1 = property1;

49

}

50

51	public int getProperty2() {

52	return property2;

53

}

54	public void setProperty2( int property2) {

55	this .property2 = property2;

56

}

57

58

}

59

60

}

Output:

Property1 value: My Prop Value Property2 value: 345

This was an example of how to get and set a bean property in Java.