Java get property value by property name

Question

Is it possible in Java to get class property value by its name? for example, i have class like

public class Test {     private String field;     public String getField() {...}     public void setField() {...} } 

and another class with Map

public class Main {     private static final Map<String, Long> map = new HashMap<String, Long>();     static {         map.put("field", new Long(1));     }     public void doSth() {     Set<String> keys = map.keySet();     Test t = new Test();     for (String key : keys) {     //t.getPropertyValueByName(key); ?     }     } 

Answer 1

You can use some of the Libraries that offer property-based access. I think the most known and used is beanutils. You can find one good example of the beanutils "in action" here. Some sample code:

A someBean = new A();  // access properties as Map Map<String, Object> properties = BeanUtils.describe(someBean); properties.set("name","Fred"); BeanUtils.populate(someBean, properties);  // access individual properties String oldname = BeanUtils.getProperty(someBean,"name"); BeanUtils.setProperty(someBean,"name","Barny");  

Answer 2

Yes. You can replace the commented out line with t.getClass().getField(map.get(key)).get(t). which will retrieve the value of the field on t.