Question

大家好（初学者在这里，请保持温柔），只是为了给您一个想法：我正在为Uni作业编写一个计算器类型的程序。使用场景生成器制作FXML文件。我有三个主要的FXML对象：一个TextField，一个ChoiceBox和一个Button。当您在选择框中选择一个选项时，需要在文本字段中输入特定的内容。最后，当您单击Button时，我们进入Java代码并基于ChoiceBox中选择的选项执行一个方法。我正在制作一种方法，尝试对Texfield中的给定字符串进行分析，并尝试查找第一个数字（负数或正数），并使用其值创建一个新的整数。如果有人可以帮助我，我将提供任何进一步的信息。

String BasicMathProblem;

@FXML
private void SolveBasicMath() {
    textview.setText(null);
    BasicMathProblem = textedit.getText();
    System.out.println("The math problem is: " + BasicMathProblem);
    int i = 0;
    char num01 = BasicMathProblem.charAt(i);
    String Negativecheck = String.valueOf(num01);
    if (Negativecheck.equals("-")) {
        System.out.println("The first number is a negative number");
        // Don't forget, you need to add a '-' to the first number!
        i = i + 1;
    } else {
        System.out.println("The first number is a positive number");
    }
    int firstspaceindex = BasicMathProblem.indexOf(' ');
    int j = 0;
    int[] firstnumberdigitsArrayIntegers = new int[firstspaceindex];
    while (Character.isDigit(num01) && firstspaceindex > i) {
        System.out.println("The 'count' coefient i = " + i);
        firstnumberdigitsArrayIntegers[j] =
                Character.getNumericValue(BasicMathProblem.charAt(i));
        i++;
        j++;
        System.out.println("The digits of the first number [" + j + "] are as following:" + firstnumberdigitsArrayIntegers[j]);
    }
}

这是我再次要提到的地方，我是一个绝对的初学者。我希望从该方法的当前状态中摆脱出来的是：包含第一个数字中每个数字的整数值的数组，我实际上得到的是：

The user selected: Basic Math
The Calculate button was just pressed
The math problem is: 23456 
The first number is a positive number
The 'count' coefient i = 0
The digits of the first number [1] are as following: 0
The 'count' coefient i = 1
The digits of the first number [2] are as following: 0
The 'count' coefient i = 2
The digits of the first number [3] are as following: 0
The 'count' coefient i = 3
The digits of the first number [4] are as following: 0
The 'count' coefient i = 4
Exception in thread "JavaFX Application Thread"             
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at

javafx.fxml / javafx.fxml.FXMLLoader $ MethodHandler.invoke（FXMLLoader.java:1787）在javafx.fxml / javafx.fxml.FXMLLoader $ ControllerMethodEventHandler.handle（FXMLLoader.java:1670）在javafx.base / com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent（CompositeEventHandler.java:86）在javafx.base / com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent（EventHandlerManager.java:238）在javafx.base / com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent（EventHandlerManager.java:191）在javafx.base / com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent（CompositeEventDispatcher.java:59）在javafx.base / com.sun.javafx.event.BasicEventDispatcher.dispatchEvent（BasicEventDispatcher.java:58）在javafx.base / com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent（EventDispatchChainImpl.java:114）在javafx.base / com.sun.javafx.event.BasicEventDispatcher.dispatchEvent（BasicEventDispatcher.java:56）在javafx.base / com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent（EventDispatchChainImpl.java:114）在javafx.base / com.sun.javafx.event.BasicEventDispatcher.dispatchEvent（BasicEventDispatcher.java:56）在javafx.base / com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent（EventDispatchChainImpl.java:114）在javafx.base / com.sun.javafx.event.EventUtil.fireEventImpl（EventUtil.java:74）在javafx.base / com.sun.javafx.event.EventUtil.fireEvent（EventUtil.java:49）在javafx.base / javafx.event.Event.fireEvent（Event.java:198）在javafx.graphics/javafx.scene.Node.fireEvent(Node.java:8890）在javafx.controls / javafx.scene.control.Button.fire（Button.java:203）在javafx.controls / com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased（ButtonBehavior.java:206）在javafx.controls / com.sun.javafx.scene.control.inputmap.InputMap.handle（InputMap.java:274）在javafx.base / com.sun.javafx.event.CompositeEventHandler $ NormalEventHandlerRecord.handleBubblingEvent（CompositeEventHandler.java:218）在javafx.base / com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent（CompositeEventHandler.java:80）在javafx.base / com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent（EventHandlerManager.java:238）在javafx.base / com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent（EventHandlerManager.java:191）在javafx.base / com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent（CompositeEventDispatcher.java:59）在javafx.base / com.sun.javafx.event.BasicEventDispatcher.dispatchEvent（BasicEventDispatcher.java:58）在javafx.base / com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent（EventDispatchChainImpl.java:114）在javafx.base / com.sun.javafx.event.BasicEventDispatcher.dispatchEvent（BasicEventDispatcher.java:56）在javafx.base / com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent（EventDispatchChainImpl.java:114）在javafx.base / com.sun.javafx.event.BasicEventDispatcher.dispatchEvent（BasicEventDispatcher.java:56）在javafx.base / com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent（EventDispatchChainImpl.java:114）在javafx.base / com.sun.javafx.event.EventUtil.fireEventImpl（EventUtil.java:74）在javafx.base / com.sun.javafx.event.EventUtil.fireEvent（EventUtil.java:54）在javafx.base / javafx.event.Event.fireEvent（Event.java:198）在javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3862）在javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1849）在javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2590）在javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:409）在javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:299）在java.base / java.security.AccessController.doPrivileged（AccessController.java:389）在javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:447）在javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:411）在javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:446）在javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556）在javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942）在javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop（本机方法）在javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174）在java.base / java.lang.Thread.run（Thread.java:835）造成原因：java.lang.reflect.InvocationTargetException 在java.base / jdk.internal.reflect.NativeMethodAccessorImpl.invoke0（本机方法）在java.base / jdk.internal.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）在java.base / jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.base / java.lang.reflect.Method.invoke（Method.java:567）在com.sun.javafx.reflect.Trampoline.invoke（MethodUtil.java:76）在jdk.internal.reflect.GeneratedMethodAccessor2.invoke（未知来源）在java.base / jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.base / java.lang.reflect.Method.invoke（Method.java:567）在javafx.base / com.sun.javafx.reflect.MethodUtil.invoke（MethodUtil.java:273）在javafx.fxml / com.sun.javafx.fxml.MethodHelper.invoke（MethodHelper.java:83）在javafx.fxml / javafx.fxml.FXMLLoader $ MethodHandler.invoke（FXMLLoader.java:1782） ...另外46个由以下原因引起：java.lang.ArrayIndexOutOfBoundsException：索引5超出长度5的范围在com.myproject.myvisualcalculator.Controller.SolveBasicMath（Controller.java:151）在com.myproject.myvisualcalculator.Controller.PressCalculate（Controller.java:40） ...还有57个

执行SolveBasicMath（）时是什么导致异常？

0 个答案: