Strings

[majik1213]

could someone please help me figure out why the console will display only 0 but never 455555?

public class Test
{
    public static void main(String[] args)
    {
        String testString = "0";
if (testString.equals("0"))
    {
        String okay=testString.replace("0", "455555");
     }   
        int test = new Integer("+okay+");
                 System.out.print("test");
    }
}

also, when I run the program, I get the following error (no compiler error, interestingly enough)

java.lang.Numbe rFormatExceptio n: For input string: "+okay+"
at java.lang.Numbe rFormatExceptio n.forInputStrin g(NumberFormatE xception.java:4 8)
at java.lang.Integ er.parseInt(Int eger.java:447)
at java.lang.Integ er.<init>(Integ er.java:620)
at Test.main(Test. java:10)

[r035198x]

could someone please help me figure out why the console will display only 0 but never 455555?

public class Test
{
    public static void main(String[] args)
    {
        String testString = "0";
if (testString.equals("0"))
    {
        testString.replace("0", "455555");
     }   
        int test = new Integer(testString);
                 System.out.print(""+test+"");
    }
}

Strings are immutable (read all about it). You cannot change their value. You can change the value being pointed to by a String variable however so you'd have to do
[CODE=java] testString = testString.repl ace("0", "455555");[/CODE]
to see the results you want

[majik1213]

Strings are immutable (read all about it). You cannot change their value. You can change the value being pointed to by a String variable however so you'd have to do
[CODE=java] testString = testString.repl ace("0", "455555");[/CODE]
to see the results you want

you are a saint, my friend

[r035198x]

you are a saint, my friend

I know a few people who would doubt that ...

[kreagan]

could someone please help me figure out why the console will display only 0 but never 455555?

 
        int test = new Integer("+okay+");
                 System.out.print("test");

also, when I run the program, I get the following error (no compiler error, interestingly enough)

java.lang.Numbe rFormatExceptio n: For input string: "+okay+"
at java.lang.Numbe rFormatExceptio n.forInputStrin g(NumberFormatE xception.java:4 8)
at java.lang.Integ er.parseInt(Int eger.java:447)
at java.lang.Integ er.<init>(Integ er.java:620)
at Test.main(Test. java:10)

You don't get a compiler error because the Integer constructor also takes Strings along with ints. The NumberFormatExc eption occurrs because "+okay+" is not an int.

int test = New Integer( "1234556"); is valid.