java.lang.IllegalArgumentException: wrong number of arguments
2012-03-31 17:27
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这几天也没事干, 玩一玩Java的反射机制, 第一天玩这个, 没想到就遇到了一个Exception, 好高兴啊! 虽然网上也有许多这方面的异常, 我看自己还是整理一下吧!
/** 一个简单的实体类 */
public class User {
private int id;
private String name;
private boolean flag;
/** 写三个构造方法, 方便测试使用 */
public User() {
}
public User(int id) {
this.id = id;
}
public User(int id, String name) {
this.id = id;
this.name = name;
}
public User(int id, String name, boolean flag) {
this.id = id;
this.name = name;
this.flag = flag;
}
/** 以下是无聊的setter和getter方法 **/
}
/** 简单测试类 **/
@Test
public void testDemo1(){
try {
// 指定构造方法
Constructor<User> con = c1.getConstructor(int.class, String.class);
User user = con.newInstance(new User()); // 这是错误的, 一般情况下也是常在这个地方出错
//User user =
con.newInstance(1); // 这是错误的
//User
user =con.newInstance(1, "wuxincheng"); // 这是正确的
//User
user =con.newInstance(1, "wuxincheng", true); // 这是错误的
System.out.println("用户标识: " + user.getId());
System.out.println("用户名称: " + user.getName());
} catch (Exception e) {
e.printStackTrace();
}
}
一般情况下是在红色部分出错, 抛出异常:
java.lang.IllegalArgumentException: wrong number of arguments
/** 一个简单的实体类 */
public class User {
private int id;
private String name;
private boolean flag;
/** 写三个构造方法, 方便测试使用 */
public User() {
}
public User(int id) {
this.id = id;
}
public User(int id, String name) {
this.id = id;
this.name = name;
}
public User(int id, String name, boolean flag) {
this.id = id;
this.name = name;
this.flag = flag;
}
/** 以下是无聊的setter和getter方法 **/
}
/** 简单测试类 **/
@Test
public void testDemo1(){
try {
// 指定构造方法
Constructor<User> con = c1.getConstructor(int.class, String.class);
User user = con.newInstance(new User()); // 这是错误的, 一般情况下也是常在这个地方出错
//User user =
con.newInstance(1); // 这是错误的
//User
user =con.newInstance(1, "wuxincheng"); // 这是正确的
//User
user =con.newInstance(1, "wuxincheng", true); // 这是错误的
System.out.println("用户标识: " + user.getId());
System.out.println("用户名称: " + user.getName());
} catch (Exception e) {
e.printStackTrace();
}
}
一般情况下是在红色部分出错, 抛出异常:
java.lang.IllegalArgumentException: wrong number of arguments
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