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String concatenation: concat() vs “+” operator
...ring b) {
a += b;
return a;
}
}
Now disassemble with javap -c (included in the Sun JDK). You should see a listing including:
java.lang.String cat(java.lang.String, java.lang.String);
Code:
0: new #2; //class java/lang/StringBuilder
3: dup
4: invokespecial ...
I can’t find the Android keytool
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keytool comes with the Java SDK. You should find it in the directory that contains javac, etc.
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Is it possible in Java to access private fields via reflection [duplicate]
Is it possible in Java to access private field str via reflection?
For example to get value of this field.
3 Answers
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Eclipse: Enable autocomplete / content assist
...ce for autocomplete. Then select the desired method and wait 500ms for the javadoc info to pop up.
If this doesn't work go to the Eclipse Windows menu -> Preferences -> Java -> Editor -> Content assist and check your settings here
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Why doesn't Java allow to throw a checked exception from static initialization block?
Why doesn't Java allow to throw a checked exception from a static initialization block? What was the reason behind this design decision?
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How to generate JAXB classes from XSD?
I'm a total newbie with XML. I'm doing a Java EE project REST implementation and we return a lot of XML. With this we decided to use JAXB. So far, we manually coded the Models for the XML.
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In Java, what does NaN mean?
...E Standard for Floating-Point Arithmetic (IEEE 754) quite explicitly which Java follows blindly. Reading the standard opens your eyes to a lot of things, the multiple values of zero being one of the things.
– Esko
Apr 11 '10 at 18:57
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How do I set the proxy to be used by the JVM
Many times, a Java app needs to connect to the Internet. The most common example happens when it is reading an XML file and needs to download its schema.
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Using Java to find substring of a bigger string using Regular Expression
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This is a working example :
RegexpExample.java
package org.regexp.replace;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexpExample
{
public static void main(String[] args)
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How can I read a large text file line by line using Java?
I need to read a large text file of around 5-6 GB line by line using Java.
21 Answers
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