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How do you compare two version Strings in Java?
...recommended by Google, the method "matches" check the entire string unlike Java that uses a regulatory pattern. (Android documentation - JAVA documentation)
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Is it better practice to use String.format over string Concatenation in Java?
...tible difference between using String.format and String concatenation in Java?
14 Answers
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Count lines of code in all java classes in Android Studio
Is there any way I can view the total lines of code in each java class in my project?
5 Answers
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Generic type parameter naming convention for Java (with multiple chars)?
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Oracle recommends the following in Java Tutorials > Generics > Generic Types:
Type Parameter Naming Conventions
By convention, type parameter names are single, uppercase letters. This stands in sharp contrast to the variable naming conventions that you ...
Initialize a long in Java
Primitive Data Types - oracle doc says the range of long in Java is -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 .
But when I do something like this in my eclipse
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Safe String to BigDecimal conversion
...);
Full code to prove that no NumberFormatException is thrown:
import java.math.BigDecimal;
public class Tester {
public static void main(String[] args) {
// TODO Auto-generated method stub
String value = "1,000,000,000.999999999999999";
BigDecimal money = new BigDe...
Where is the documentation for the values() method of Enum?
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You can't see this method in javadoc because it's added by the compiler.
Documented in three places :
Enum Types, from The Java Tutorials
The compiler automatically adds some special methods when it creates
an enum. For example, they have a st...
Java, Simplified check if int array contains int
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Here is Java 8 solution
public static boolean contains(final int[] arr, final int key) {
return Arrays.stream(arr).anyMatch(i -> i == key);
}
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last day of month calculation
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java.time.temporal.TemporalAdjusters.lastDayOfMonth()
Using the java.time library built into Java 8, you can use the TemporalAdjuster interface. We find an implementation ready for use in the TemporalAdjusters utility class: ...
Java Generics Wildcarding With Multiple Classes
... you need.
This can get arbitrarily complicated. To demonstrate, see the JavaDoc declaration of Collections#max, which (wrapped onto two lines) is:
public static <T extends Object & Comparable<? super T>> T
max(Collection<? extends T&g...