java - 这个 NumberFormatException 是什么意思？

Question

java.lang.NumberFormatException: For input string: ":"  

这是什么意思？如果我运行代码(如下)，我会收到上述错误。我是这里的初学者。和..

  stacktrace:[Ljava.lang.StackTraceElement;@e596c9

代码:

try
{
    Class.forName("java.sql.DriverManager");
    Connection con=DriverManager.getConnection("jdbc:mysql://localhost/bvdb","root","enter")
            Statement stm=con.createStatement();
    String m="-",t="-",w="-",th="--",f="-",st="--",s="-",runson;
    if(jCheckBox1.isSelected()==true){
        m="m";}

    if(jCheckBox2.isSelected()==true){
        t="t";}
    if(jCheckBox3.isSelected()==true){
        w="w";}
    if(jCheckBox4.isSelected()==true){
        th="th";}
    if(jCheckBox5.isSelected()==true){
        f="f";}
    if(jCheckBox6.isSelected()==true){
        st="st";}
    if(jCheckBox7.isSelected()==true){
        s="s";}
    runson= m + t + w + th + f + st + s ;
    int h1=Integer.valueOf(jTextField10.getText().substring(0,2)
            int mins1=Integer.valueOf(jTextField10.getText().substring(3,5));
    int h2=Integer.valueOf(jTextField12.getText().substring(0,2));
    int mins2=Integer.valueOf(jTextField12.getText().substring(2,3));
    Boolean x=jTextField10.getText().substring(2,3).equals(":");
    Boolean y=jTextField12.getText().substring(2,3).equals(":");
    String time1=jTextField10.getText().substring(0,2)+jTextField10.getText().substring (2,3)+jTextField10.getText().substring(3,5);
    String time2=jTextField12.getText().substring(0,2)+jTextField12.getText().substring(2,3)+jTextField12.getText().substring(3,5);
    String tfac1=jTextField13.getText();
    String tfac2=jTextField14.getText();
    String  tfac3=jTextField15.getText();
    String tfsl=jTextField16.getText();
    if(Integer.valueOf(jTextField3.getText())==0){
        tfac1="0";
        if(Integer.valueOf(jTextField4.getText())==0){
            tfac2="0";}
        if(Integer.valueOf(jTextField5.getText())==0){
            tfac3="0";}
        if(Integer.valueOf(jTextField6.getText())==0){
            tfsl="0";}
        if(y==true&&x==true&&jTextField1.getText().trim().length()<=6&&jTextField2.getText().trim().length()<=30&&h1<=24&&h2<=24&&mins1<=59&&mins2<=59){
            String q="INSERT INTO TRAININFO VALUE ("+jTextField1.getText()+",'"+jTextField2.getText()+"','"+jTextField9.getText()+"','"+time1+"','"+jTextField11.getText()+"','"+time2+"','"+runson+"',"+tfac1+","+tfac2+ ","+tfac3+","+tfsl+","+jTextField3.getText()+","+jTextField4.getText()+","+jTextField5.getText()+","+jTextField6.getText()+");";

            stm.executeUpdate(q);

            JOptionPane.showMessageDialog("ADDED");
        }
    }
    catch (Exception e){
        e.printStackTrace();
    }

Answer 1

这意味着您无法将 String ":" 转换为 Number，如 integer 或 双

请参阅下面的链接

http://docs.oracle.com/javase/7/docs/api/java/lang/NumberFormatException.html

根据java文档

Thrown to indicate that the application has attempted to convert a string to one of the numeric types, but that the string does not have the appropriate format.