This is an example of how to get and set a bean property. We are using the Statement 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
Beanclass in the example. It has two String properties and getters and setters for the properties. - Create a new object of
Beanclass. - Create a new Statement object for the specified object to invoke the
setProperty1method and by a String array of arguments. - Call the
execute()API method of Statement. It finds a method whose name is the same as themethodNameproperty, 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
Beanobject to invoke thegetProperty1method by the array of arguments. - Call
execute()API method of Expression. It finds a method whose name is the same as themethodNameproperty, and invokes the method on theBeanobject. - 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:
package com.javacodegeeks.snippets.core;
import java.beans.Expression;
import java.beans.Statement;
public class GetSetBeanProperty {
public static void main(String[] args) throws Exception {
Object o = new Bean();
Statement stmt;
Expression expr;
// Set the value of property1
stmt = new Statement(o, "setProperty1", new Object[]{"My Prop Value"});
stmt.execute();
// Get the value of property1
expr = new Expression(o, "getProperty1", new Object[0]);
expr.execute();
System.out.println("Property1 value: " + (String)expr.getValue());
/////////////////////////////////////////////
// Set the value of property2
stmt = new Statement(o, "setProperty2", new Object[]{new Integer(345)});
stmt.execute();
// Get the value of property2
expr = new Expression(o, "getProperty2", new Object[0]);
expr.execute();
System.out.println("Property2 value: " + (Integer)expr.getValue());
}
public static class Bean {
// Property property1
private String property1;
// Property property2
private int property2;
public String getProperty1() {
return property1;
}
public void setProperty1(String property1) {
this.property1 = property1;
}
public int getProperty2() {
return property2;
}
public void setProperty2(int property2) {
this.property2 = property2;
}
}
}Output:
Property1 value: My Prop Value Property2 value: 345
This was an example of how to get and set a bean property in Java.
