There are 3 permutations of a try...catch...finally block in java.
try...catch
try...catch...finally
try...finally
Once the finally block is executed, control goes to the next line after the finally block. If I remove the finally block and move all its statements to the line after the try...catch block, would that have the same effect as having them in the finally block?
What is the mistake in the following code?
while ((char t==(char) System.in.read())!='0')
I'm taking user input from System.in using a java.util.Scanner. I need to validate the input for things like:
It must be a non-negative number
It must be an alphabetical letter
... etc
What's the best way to do this?
Hi I have Map of String values.
I want to cast this value at runtime.
e.g.
Map map = new HashMap();
map.put("key1","101");
map.put("key2","45.40");
Now runtime I know key1 is integer and key2 is double
How can I cast this.
I tried this:
("101").getClass().cast(Integer).
//////////////////////////////////////////////
e.g. ...........
String integerClass = "java.lang.Integer";
String...
I have conversion to Map problem in Core Java.
Below is requirement:
Given a String array below
String str[] = {"abc","123","def","456","ghi","789","lmn","101112","opq"};
Convert it into a Map such that the resultant output is below
Output
====== ======
key Value
====== ======
abc true
123...
I'm wondering how to do something only if Integer.parseInt(whatever) doesn't fail.
More specifically I have a jTextArea of user specified values seperated by line breaks.
I want to check each line to see if can be converted to an int.
Figured something like this, but it doesn't work:
for(int i = 0; i < worlds.jTextArea1.getLineCount(); i++){
if(Integer.parseInt(worlds...
How to convert ASCII to hexadecimal values in java.
For example:
ASCII: 31 32 2E 30 31 33
Hex: 12.013
There are 20 buttons in an Activity .
The ids are R.id.ButtonR1C1; R.id.ButtonR1C2 .. and so on ie. Row 1, Col 1..
now earlier I had created 20 buttons.
private Button b1,b2,b3...;
and then
b1=(Button)findViewbyId(R.id.ButtonR1C1);
b2=(Button)findViewbyId(R.id.ButtonR1C2);
.... and so on.
Finally
b1.setOnClickListener(this);
b2.setOnClickListener(this);
... 20
so I thought I'd ...
How can I cast an Object to an int in java?
this article suggests you can use Color c = Color.decode("FF0096"); however this understandably throws an exception
Caused by: java.lang.NumberFormatException: For input string: "FF0096"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
at java.lang.Integer.parseInt(Integer.java:449)
at java.lang.Integer.valueOf(Integer.java:528)
at java.lang.Inte...
i have this in a class:
/* parses a Value out of a String */
public static int parseValue(final String text) throws NumberFormatException {
String cleanedValue = text.replace("-", "").replace(",", ".");
return Math.round(Float.parseFloat(cleanedValue) * 100);
}
For some reason javac doesn't complain that i don't catch the NumberFormatException in the calling code.
Can someone tell ...
import java.io.*;
public class Thamer
{
public static void main(String args[])
{
String str = "thamer";
//approach 1: to convert String to int
int int1 = Integer.parseInt(str);
System.out.println( "int1 = " + int1 );
//approach 2: to convert String to int
int int2 = Integer.valueOf(str);
System.out.println( "int2 = " + int2...
in my project i have main window in which i have taken update button but when i am updating the data its showing error i.e error:For input string: "2345678.0"
//entire o/p
init:
Deleting: C:\Documents and Settings\amit bidwai\sanskar1\build\built-jar.properties
deps-jar:
Updating property file: C:\Documents and Settings\amit bidwai\sanskar1\build\built-jar.properties
compile:
run:
Driver lo...
try{
if (flag_conv == false)
{
if ((Integer.parseInt(et1.getText().toString()))<=55)
{
final AlertDialog alertDialog = new AlertDialog.Builder(this).create();
alertDialog.setTitle("Reset...");
alertDialog.setMessage("WB should be grater than 55");
alertDialog.setButton2("OK", new DialogInterface.OnClickListener() {
public void on...
Hi there I have a calculation application which I need to validate the fields to check if the values entered are numeric numbers and not alphanumeric. I have some ideas about the codes:
Please guide me if I have done anything wrong or seem noob as this is my first time trying out Swing.
private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {
String text1 = jTextField1.getT...
This is what I have written so far but when exception is raised it does not again ask the user for input.
do {
System.out.println("Enter the number of stones to play with: ");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String temp = br.readLine();
key = Integer.parseInt(temp);
} while (key < 0 && key > 9);
...
