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Get string character by index - Java
...ystem.out.println(charAtZero); // Prints f
For more information, see the Java documentation on String.charAt. If you want another simple tutorial, this one or this one.
If you don't want the result as a char data type, but rather as a string, you would use the Character.toString method:
String t...
Checking for a null int value from a Java ResultSet
In Java I'm trying to test for a null value, from a ResultSet, where the column is being cast to a primitive int type.
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Package structure for a Java project?
Whats the best practice for setting up package structures in a Java Web Application?
7 Answers
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Use of Java's Collections.singletonList()?
What is the use of Collections.singletonList() in Java? I understand that it returns a list with one element. Why would I want to have a separate method to do that? How does immutability play a role here?
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What is the volatile keyword useful for?
At work today, I came across the volatile keyword in Java. Not being very familiar with it, I found this explanation .
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Eclipse error: 'Failed to create the Java Virtual Machine'
...ms\jdk1.6\bin lines.
Also, a general recommendation: set -Dosgi.requiredJavaVersion=1.6, not 1.5.
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Best Java obfuscator? [closed]
I am developing a security software and want to obfuscate my java code so it will become impossible to reverse engineer. What is the most reliable java obfuscator ?
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Why when a constructor is annotated with @JsonCreator, its arguments must be annotated with @JsonPro
...object to the constructor.
It is not possible to access parameter names in Java using reflection - that's why you have to repeat this information in annotations.
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java.util.Date to XMLGregorianCalendar
Isn't there a convenient way of getting from a java.util.Date to a XMLGregorianCalendar?
9 Answers
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Compare two objects in Java with possible null values
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This is what Java internal code uses (on other compare methods):
public static boolean compare(String str1, String str2) {
return (str1 == null ? str2 == null : str1.equals(str2));
}
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