Java反射机制（Reflection）浅析

public class Person {

private int age;

private String name = "";

private String[] arr = new String[2];

public Person(){}

public Person(String name,int age){
this.name = name;
this.age = age;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String[] getArr() {
return arr;
}

public void setArr(String[] arr) {
this.arr = arr;
}

}

@SuppressWarnings("unchecked")
public static Object copy(Object object) throws Exception {
// 获得对象类型
Class classType = object.getClass();
System.out.println("" + classType.getName()); // 通过默认构造方法创建一个新的对象
Object objectCopy = classType.getConstructor(new Class[] {})
.newInstance(new Object[] {}); // 获得对象的所有属性
Field fields[] = classType.getDeclaredFields();
for (int i = 0; i < fields.length; i++) {
Field field = fields[i];
String fieldName = field.getName();
String firstLetter = fieldName.substring(0, 1).toUpperCase(); // 获得和属性对应的getXXX()方法的名字
String getMethodName = "get" + firstLetter + fieldName.substring(1); // 获得和属性对应的setXXX()方法的名字
String setMethodName = "set" + firstLetter + fieldName.substring(1); // 获得和属性对应的getXXX()方法
Method getMethod = classType.getMethod(getMethodName,
new Class[] {}); // 获得和属性对应的setXXX()方法
Method setMethod = classType.getMethod(setMethodName,
new Class[] { field.getType() }); // 调用原对象的getXXX()方法
Object value = getMethod.invoke(object, new Object[] {});
System.out.println(fieldName + ":" + value); // 调用拷贝对象的setXXX()方法
setMethod.invoke(objectCopy, new Object[] { value });
}
return objectCopy;
}