Question

java编译后Exception in thread "main" java.lang.Error: Unresolved compilation problem:

import java.io.*;
import java.util.*;
import java.io.IOException;
public class bankaccount {
private String account_name,id,psw;
private Calendar now;
private float remain_account;
private int account_no,year,month,day;
static int count=0;

public void start_account(String name,String id,float remain,String psw){
//开户
count++;
account_no=count;
account_name=name;
this.id=id;
this.psw=psw;
remain_account=remain;
Calendar now=Calendar.getInstance();
System.out.println("你的账户已开启，账户信息为：");
System.out.println("账户号："+account_no+" "+"用户名："+account_name+" "+"开户时间："+now.get(Calendar.YEAR)+"-"+now.get(Calendar.MONTH)+"-"+now.get(Calendar.DATE)+" "+"存入："+remain+"元");

}
public void qukuan(float sum) throws IOException{
byte buffer[]=new byte[3];
System.out.println("请输入密码：");
int mycount=System.in.read(buffer);
String input=new String(buffer);
if(this.psw.equals(input)){
if(this.remain_account<=sum){
this.remain_account=this.remain_account-sum;
System.out.println("取款成功，当前余额为："+this.remain_account);
return;
}
else{
System.out.println("余额不足！");
return;
}
}
else {
System.out.println("密码错误！");
return;
}
}
public int chaxun() throws IOException{
byte buffer[]=new byte[3];
System.out.println("请输入密码：");
int mycount=System.in.read(buffer);
String input=new String(buffer);
if(this.psw.equals(input)){
return this.remain_account;
}
else{
System.out.println("密码错误！");
return 0;
}
}

}
public class TestBank {

/**
* @param args
*/
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
byte buffer[]=new byte[100];
boolean j=true;
bankaccount newacc=new bankaccount();
while(j){
System.out.println();
System.out.println("请选择1或2");
System.out.println("1.开户");
System.out.println("2.取款");
System.out.println("3.退出");
int mycount=System.in.read(buffer);
String input="";
int i=buffer[0]-48;
input=input+i;
switch(new Integer(input)){
case 1:newacc.start_account("姓名", "010101", 5000, "123");break;
case 2:newacc.qukuan(500) ;break;
case 3:j=false;break;
default:System.out.println("输入错误！");
}
}
}

}

Answer 1

return this.remain_account;

这个返回数值是float类型的；但是你的方法返回类型是int类型

Answer 2

你的程序在
chaxun的method里面有问题
你的method返回类型为int
但你return的是float
改为：public float chaxun() throws IOException{

追问

已经改过了，但是依旧出现Exception in thread "main" java.lang.Error: Unresolved compilation problem:

at TestBank.main(bankaccount.java:66)

追答

你看下报的at TestBank.main(bankaccount.java:66)
是在哪一行代码~
你贴出来的代码 看不了