Question

在我的代码的这一部分中，我正在创建类Dizionario的对象并将其写入文件，首先调用construcor，接受3个参数，（Path，String，int）。我从3个JTextField得到这3个参数，特别是最后一个（JTextField3）正在创建这个错误，转换为int

这是错误：

Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: "javax.swing.JTextField[,62,11,302x28,layout=javax.swing.plaf.basic.BasicTextUI$UpdateHandler,alignmentX=0.0,alignmentY=0.0,border=javax.swing.plaf.synth.SynthBorder@9577f8b,flags=288,maximumSize=,minimumSize=,preferredSize=,caretColor=,disabledTextColor=DerivedColor(color=142,143,145 parent=nimbusDisabledText offsets=0.0,0.0,0.0,0 pColor=142,143,145,editable=true,margin=javax.swing.plaf.InsetsUIResource[top=0,left=0,bottom=0,right=0],selectedTextColor=DerivedColor(color=255,255,255 parent=nimbusSelectedText offsets=0.0,0.0,0.0,0 pColor=255,255,255,selectionColor=DerivedColor(color=57,105,138 parent=nimbusSelectionBackground offsets=0.0,0.0,0.0,0 pColor=57,105,138,columns=0,columnWidth=0,command=,horizontalAlignment=LEADING]"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:492)
at java.lang.Integer.<init>(Integer.java:677)

我尝试使用这些代码将字符串转换为整数：

int i = new Integer(jTextField3.toString());

然后将i作为参数（或直接调用new Integer（...）作为参数）

(int)JTextField3.toString();

Integer.ParseInt(JTextField3.toString());

这是我的方法

    private void CreateMouseClicked(java.awt.event.MouseEvent evt) {                                    
    Dizionario dic = new Dizionario(
            (Paths.get(jTextField2.toString())),
            jTextField1.toString(),
            Integer.parseInt(jTextField3.toString())); 
    dic.writeToFile();
}

Answer 1

嗯，它不是jTextField3.toString()，而是jTextField3.getText()。这是一个很大的区别，要查看toString()返回的内容，请查看您的错误消息。你试图解析这个：

"javax.swing.JTextField[,62,11,302x28,layout=javax.swing.plaf.basic.BasicTextUI$UpdateHandler,alignmentX=0.0,alignmentY=0.0,border=javax.swing.plaf.synth.SynthBorder@9577f8b,flags=288,maximumSize=,minimumSize=,preferredSize=,caretColor=,disabledTextColor=DerivedColor(color=142,143,145 parent=nimbusDisabledText offsets=0.0,0.0,0.0,0 pColor=142,143,145,editable=true,margin=javax.swing.plaf.InsetsUIResource[top=0,left=0,bottom=0,right=0],selectedTextColor=DerivedColor(color=255,255,255 parent=nimbusSelectedText offsets=0.0,0.0,0.0,0 pColor=255,255,255,selectionColor=DerivedColor(color=57,105,138 parent=nimbusSelectionBackground offsets=0.0,0.0,0.0,0 pColor=57,105,138,columns=0,columnWidth=0,command=,horizontalAlignment=LEADING]"

加入数字。

Answer 2

请勿使用JTextField#toString，请使用JTextField#getText返回文字字段的文字内容，例如......

int i = new Integer(jTextField3.getText());

toString通常用于提供有关Object

的有用诊断信息

尝试将JTextField转换为int时的NumberFormatException

2 个答案: