下面那段代码是照着书上敲出来的,但是输出错误,请问为什么?(我是菜鸟级,请讲容易理解,谢谢~)
class PasswordException extends Exception{
private int i=0;
public PasswordException (int i){
super();
this.i=i;
}
public String getMessage(){
if(i==0){
return "没有这个用户";
}
else if(i==1){
return "密码错误,请重新输入";
}
return " ";
}
}public class UserLogin {
private String userName="";
private String password="";
public void login() {
InputStreamReader isr=new InputStreamReader(System.in);
BufferedReader br =new BufferedReader(isr);
System.out.println("请输入用户名:");
try{
userName=br.readLine();
}
catch(IOException e){
}
System.out.println("请输入密码:");
try{
password=br.readLine();
}
catch(IOException e){
}
}
public void checkPassword() throws PasswordException{
if(!userName.equals("administrator")){
throw(new PasswordException(0));
}
else if(!password.equals("admin")){
throw(new PasswordException(1));
}
}
public static void main(String[] args) {
UserLogin app=new UserLogin();
app.login();
try{
app.checkPassword();
System.out.println("密码已验证正确");
}
catch (Exception e){
System.out.println(e.getMessage());
}
}
}
class PasswordException extends Exception{
private int i=0;
public PasswordException (int i){
super();
this.i=i;
}
public String getMessage(){
if(i==0){
return "没有这个用户";
}
else if(i==1){
return "密码错误,请重新输入";
}
return " ";
}
}public class UserLogin {
private String userName="";
private String password="";
public void login() {
InputStreamReader isr=new InputStreamReader(System.in);
BufferedReader br =new BufferedReader(isr);
System.out.println("请输入用户名:");
try{
userName=br.readLine();
}
catch(IOException e){
}
System.out.println("请输入密码:");
try{
password=br.readLine();
}
catch(IOException e){
}
}
public void checkPassword() throws PasswordException{
if(!userName.equals("administrator")){
throw(new PasswordException(0));
}
else if(!password.equals("admin")){
throw(new PasswordException(1));
}
}
public static void main(String[] args) {
UserLogin app=new UserLogin();
app.login();
try{
app.checkPassword();
System.out.println("密码已验证正确");
}
catch (Exception e){
System.out.println(e.getMessage());
}
}
}
/**
*
*/
private static final long serialVersionUID = 1L;
private int i = 0; public PasswordException(final int i) {
super();
this.i = i;
} public String getMessage() {
if (i == 0) {
return "没有这个用户";
} else if (i == 1) {
return "密码错误,请重新输入";
}
return " ";
}
}public class UserLogin {
private String userName = "";
private String password = ""; public void login() {
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
System.out.println("请输入用户名:");
try {
userName = br.readLine();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("请输入密码:");
try {
password = br.readLine();
} catch (IOException e) {
e.printStackTrace();
}
} public void checkPassword() throws PasswordException {
if (!userName.equals("administrator")) {
throw new PasswordException(0);
} else if (!password.equals("admin")) {
throw new PasswordException(1);
}else{
System.out.println("密码已验证正确");
}
} public static void main(String[] args) {
UserLogin app = new UserLogin();
app.login();
try {
app.checkPassword();
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
*
*/
package cn.luochengor.csdn;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;/**
*
* @Author luochengor
* @Date Nov 26, 2011
* @Email [email protected]
*/
@SuppressWarnings("serial")
class PasswordException extends Exception {
private int i = 0; public PasswordException(int i) {
super();
this.i = i;
} public String getMessage() {
if (i == 0) {
return "没有这个用户";
} else if (i == 1) {
return "密码错误,请重新输入";
}
return " ";
}
}public class UserLogin {
private String userName = "";
private String password = ""; public void login() {
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
System.out.println("请输入用户名:");
try {
userName = br.readLine();
} catch (IOException e) {
System.out.println("输入被中断");
}
System.out.println("请输入密码:");
try {
password = br.readLine();
} catch (IOException e) {
System.out.println("输入被中断");
}
} public void checkPassword() throws PasswordException {
if (!userName.equals("administrator")) {
throw (new PasswordException(0));
} else if (!password.equals("admin")) {
throw (new PasswordException(1));
}
} public static void main(String[] args) {
UserLogin app = new UserLogin();
app.login();
try {
app.checkPassword();
System.out.println("密码已验证正确");
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
运行结果1:
请输入用户名:
administrator
请输入密码:
admin
密码已验证正确运行结果2:
请输入用户名:
admin
请输入密码:
admin
没有这个用户