将字符串数组转换为int

Question

I am trying to convert a array with text and numbers to an int.

the array separated :

• separated[0] some text
• separated[1] 1
• separated[2] some more text

What I want is that the [1] ends up being a int.

I tried:

int logSetting = Integer.parseInt(String.valueOf(separated));

and

int logSetting = Integer.parseInt(String.valueOf(separated[1]));

Both made the app crash

 09-16 09:57:30.865: E/AndroidRuntime(27938): FATAL EXCEPTION: main 09-16 09:57:30.865: E/AndroidRuntime(27938): Process: my.project, PID: 27938 09-16 09:57:30.865: E/AndroidRuntime(27938): java.lang.NumberFormatException: Invalid int: 

"[Ljava.lang.String;@42b273f0"

 09-16 09:57:30.865: E/AndroidRuntime(27938): at java.lang.Integer.invalidInt(Integer.java:137) 09-16 09:57:30.865: E/AndroidRuntime(27938): at java.lang.Integer.parse(Integer.java:374) 09-16 09:57:30.865: E/AndroidRuntime(27938): at java.lang.Integer.parseInt(Integer.java:365) 09-16 09:57:30.865: E/AndroidRuntime(27938): at java.lang.Integer.parseInt(Integer.java:331) 09-16 09:57:30.865: E/AndroidRuntime(27938): at my.project.MainActivity.fileReader(MainActivity.java:928) 09-16 09:57:30.865: E/AndroidRuntime(27938): at my.project.MainActivity.logCat(MainActivity.java:944) 09-16 09:57:30.865: E/AndroidRuntime(27938): at my.project.MainActivity$1.run(MainActivity.java:854) 09-16 09:57:30.865: E/AndroidRuntime(27938): at android.os.Handler.handleCallback(Handler.java:733) 09-16 09:57:30.865: E/AndroidRuntime(27938): at android.os.Handler.dispatchMessage(Handler.java:95) 09-16 09:57:30.865: E/AndroidRuntime(27938): at android.os.Looper.loop(Looper.java:157) 09-16 09:57:30.865: E/AndroidRuntime(27938): at android.app.ActivityThread.main(ActivityThread.java:5356) 09-16 09:57:30.865: E/AndroidRuntime(27938): at java.lang.reflect.Method.invokeNative(Native Method) 09-16 09:57:30.865: E/AndroidRuntime(27938): at java.lang.reflect.Method.invoke(Method.java:515) 09-16 09:57:30.865: E/AndroidRuntime(27938): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265) 09-16 09:57:30.865: E/AndroidRuntime(27938): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081) 09-16 09:57:30.865: E/AndroidRuntime(27938): at dalvik.system.NativeStart.main(Native Method) 

Answer 1

You can do something like this

String[] separated=new String[]{"some text ","1","some more text"};
int logSetting = 0;
  for(String i:separated){
     try {
        logSetting = Integer.parseInt(i);
      }catch (NumberFormatException e){
        System.out.println("NumberFormatException \""+i+"\" is not a number");
      }
     }
  System.out.println(logSetting);

Out put:

 NumberFormatException "some text " is not a number
 NumberFormatException "some more text" is not a number
 1

Answer 2

You're almost there, int logSetting = Integer.parseInt(String.valueOf(separated[1])); should just be int logSetting = Integer.parseInt(separated[1]); . If this doesn't work its probably something else crashing your code. What error do you get?

Answer 3

Based on your exception which is NumberFormatException , when you try to convert a String to a numeric value, like an int, float, double, long, etc which does not have right format

For example:

public class ConvertStringToNumber
{

  public static void main(String[] args)
  {
    try
    {
      String s = "FOOBAR";
      int i = Integer.parseInt(s); <--this line of code will never be reached
      System.out.println("int value = " + i);
    }
    catch (NumberFormatException nfe)
    {
      nfe.printStackTrace();
    }
  }

1. Source for the Code
2. Read more and Another Source