assignfielddemo.java

来自「金旭亮的java教案」· Java 代码 · 共 42 行

 
import java.lang.reflect.Field; 

 class TestField {
    public int testInt;
    public String testString;
    
    public String toString() {
        return testInt + ":" + testString;
    }
}
 
public class AssignFieldDemo {
    public static void main(String[] args) {
        try {
            Class c = Class.forName("TestField");
            Object targetObj = c.newInstance();
            
            Field testInt = c.getField("testInt");
            testInt.setInt(targetObj, 99);
            
            Field testString = c.getField("testString");
            testString.set(targetObj, "jxl");
            
            System.out.println(targetObj);
        } catch(ArrayIndexOutOfBoundsException e) {
            System.out.println("没有指定类");
        } catch (ClassNotFoundException e) {
            System.out.println("找不到指定的类");
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            System.out.println("找不到指定的域成员");
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }       
    }
}