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How to check if a String is numeric in Java
...
With Apache Commons Lang 3.5 and above: NumberUtils.isCreatable or StringUtils.isNumeric.
With Apache Commons Lang 3.4 and below: NumberUtils.isNumber or StringUtils.isNumeric.
You can also use StringUtils.isNumericSpace which returns true for...
Spring MVC: Complex object as GET @RequestParam
...or request mentioned in answer:
"Failed to convert value of type 'java.lang.String[]' to required type
'java.lang.Long[]'; nested exception is
java.lang.NumberFormatException: For input string: \"353,234\""
The data class will work only for the following request params form:
http://localh...
Check if a Class Object is subclass of another Class Object in Java
...nisms: Class.isInstance(object) download.oracle.com/javase/6/docs/api/java/lang/…
– Sean Patrick Floyd
Jan 3 '11 at 13:06
5
...
When to use Comparable and Comparator
...
Comparable - java.lang.Comparable: int compareTo(Object o1)
A comparable object is capable of comparing itself with another object. The class itself must implements the java.lang.Comparable interface in order to be able to compare its instanc...
What's the difference of strings within single or double quotes in groovy?
...dard Java String. For example:
println 'hi'.class.name // prints java.lang.String
println "hi".class.name // prints java.lang.String
def a = 'Freewind'
println "hi $a" // prints "hi Freewind"
println "hi $a".class.name // prints org.codehaus.groovy.runtime.GStringImpl
If you tr...
Calling JMX MBean method from a shell script
...anage
server to proxy commands through)
Groovy JMX Example:
import java.lang.management.*
import javax.management.ObjectName
import javax.management.remote.JMXConnectorFactory as JmxFactory
import javax.management.remote.JMXServiceURL as JmxUrl
def serverUrl = 'service:jmx:rmi:///jndi/rmi://loca...
What's the nearest substitute for a function pointer in Java?
...AsInt(7315, 89163);
System.out.println(i);
}
}
import java.lang.Math;
class B {
public static void main(String[] args) {
A.method(Math::max);
}
}
In general, you can use:
method1(Class1::method2);
instead of:
method1((arg1, arg2) -> Class1.method2(arg1, arg2...
Should private helper methods be static if they can be static
...
Compiled from "TestBytecodeSize.java"
class TestBytecodeSize extends java.lang.Object{
TestBytecodeSize();
Code:
0: aload_0
1: invokespecial #1; //Method java/lang/Object."<init>":()V
4: return
private void doSomething(int);
Code:
0: return
private static void doSo...
What's the difference between --general-numeric-sort and --numeric-sort options in gnu sort
...
Even with LANG=C, I can’t get -n to recognize comma as a thousands separator – “1,000” is treated the same as “1”.
– Scott
Apr 26 '14 at 20:22
...
Converting JSONarray to ArrayList
...ng a JSON string to ArrayList<Model>:
Note: You have to import java.lang.reflect.Type;:
// Top of file
import java.lang.reflect.Type;
// ...
private void parseJSON() {
Gson gson = new Gson();
Type type = new TypeToken<List<ContactModel>>(){}.getType();
List<Conta...