我做了一个简单的程序: 处理文件(读写) 结束类扩展 但该程序不起作用。 Netbeans 没有显示错误,但是当我运行它时……出现了某种错误……而且我不明白我的错误在哪里(我认为这是一个合乎逻辑的错误)。
这是一个简单的程序:
package detyre_kursi;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;
public class Detyre_kursi {
public static void main(String[] args) {
LlogariBankare llogaria1 = new LlogariBankare("aaa", 1000);
llogaria1.Balanca();
}
}
class LlogariBankare {
//variablat e instances
private String id;
private int nrLlogarise;
private int vitiHapjes;
private double balanca;
static int nrTranasksioneve = 0;
public LlogariBankare() {
System.out.println("Ju keni harruar te vendosi id dhe nrLlogarise");
}
public LlogariBankare(String id, int nrLlogarise) {
this.id = id;
this.nrLlogarise = nrLlogarise;
vitiHapjes = 0;
balanca = 0;
Lexim(this.id, this.nrLlogarise);
}
public double getBalanca() {
return balanca;
}
public int getVitiHapjes() {
return vitiHapjes;
}
private void Lexim(String s, int llog) {
try {
File file = new File("c:\\java\\balanca.txt");
Scanner scanner = new Scanner(file);
while (scanner.hasNextLine()) {
if (scanner.next().equals(s) && scanner.nextInt() == llog) {
vitiHapjes = scanner.nextInt();
balanca = scanner.nextDouble();
}
}
} catch (IOException e) {
e.getMessage();
}
}
void Balanca() {
try{
File file = new File("c:\\java\\test.txt");
PrintWriter out = new PrintWriter(file);
out.println(this.balanca);
} catch (IOException e) {
e.getMessage();
}
System.out.println(this.id + " , ju keni " + this.balanca +
" lek ne llogarine tuaj te krijuar ne vitin " + vitiHapjes +
" dhe keni kryer " + nrTranasksioneve + " transaksione gjithsej");
}
void Terheqe(double terheqe) {
this.balanca -= terheqe;
System.out.println("Ju sapo keni terhequr " + terheqe + " nga llogaria juaj");
nrTranasksioneve++;
}
void Depozitim(double depozitim) {
this.balanca += depozitim;
System.out.println("Ju sapo keni depozituar " + depozitim + " nga llogaria juaj");
nrTranasksioneve++;
}
}
class Interesi extends LlogariBankare {
int vitiTanishem = 2012;
double interesi = 0;
int diferencaViteve = vitiTanishem - getVitiHapjes();
Interesi(String id, int nrLlogarise) {
super(id,nrLlogarise);
}
void gjejInteresisn() {
interesi = getBalanca() + getBalanca() * diferencaViteve * 0.01;
}
}
文件 balanca 中有这一行: AAA 1000 1990 34000
简而言之,这是银行的一些简单版本。
您从文件中读取余额,并且 您可以使用 Terheqe() 和 Depozitim() 来表示 - 和 + 余额。 您可以使用 Balance() 来查看您有多少美元。当我运行它时,出现以下错误:
Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:907)
at java.util.Scanner.next(Scanner.java:1416)
at detyre_kursi.LlogariBankare.Lexim(Detyre_kursi.java:57)
at detyre_kursi.LlogariBankare.<init>(Detyre_kursi.java:40)
at detyre_kursi.Detyre_kursi.main(Detyre_kursi.java:11)
Java 结果:1
最佳答案
此行导致问题。 Scanner.nextInt() 可能不是 int,我觉得除非有特定原因,否则进行两次 next() 调用并不好。
if(scanner.next().equals(s)&&scanner.nextInt()==llog){
关于java - 找不到我的逻辑错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8990049/