String methods

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posted 17 years ago

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String s17="AMIT";
String s18="amit";
String s19=" amit ";
System.out.println(s19.trim()==s18);-false
System.out.println(s19.trim().equals(s18));-true
System.out.println(s18.toUpperCase()==s17);-false
System.out.println(s18.toUpperCase().equals(s17));-true

I just want to clear my doubt. Do substring, replace, trim & to UpperCase all String methods returns new instance? I just conclude from above output.

Correct me if I am wrong.

SCJP-1.5 SCWCD-1.4

Jesper de Jong

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posted 17 years ago

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If you really want to know, you can have a look at the source code for class String. You can find it in the file src.zip which is in your JDK installation directory.

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dolly shah

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posted 17 years ago

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Should I except this kind of questions on the real exam?

SCJP-1.5 SCWCD-1.4

P Ventura

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posted 17 years ago

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Generally, String methods return a new String literal.

StringBuilder methods modify the source String.

Objective: SCJP 1.5 <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Thread.html" target="_blank" rel="nofollow">API</a> <blockquote>code:<hr><pre> Double n1 = Double.NaN; Double n2 = Double.NaN; n1.equals(n2) // true even though Double.NaN != Double.NaN -0.0 == +0.0; // true Double n1 = -0.0;Double n2 = +0.0; n1.equals(n2) // false even though -0.0 == +0.0 </pre><hr></blockquote>

Yogesh Baraskar

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posted 17 years ago

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Strings are im.mutable objects

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