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How can I have a second string in my HashMap?
The hashmap works with



<String, Double, String>


But not with

What does ... mean in this



public Unit(Unit... childeren){


In the code bellow:

What does this ++ do in this method?



protected int frames;
protected int delay;

@Override
public void update()
{

Smart suggestions!

What do I have to return after the the if/else statement in my boolean method?



public class Hoofd {
public static boolean getName(String x)
{
if(x == "jennifer")
...

Why would somebody write a singleton like this (with volatile and synchronized)?



public class Singleton {
private volatile static Singleton singleton;

private Singleton(){}
...

Task :Student.main() FAILED
Exception in thread "main" java.lang.NullPointerException
at demo.Student.setStudents(Student.java:19)
at demo.Student.main(Student.java:28)

FAILURE: Build failed...

Why does my code not work?



package demo;

import java.util.List;

public class Student {
private String naam;

Could somebody explain what this method does do?



public boolean equals(Object object){
if(object instanceof Product){
Product product= (Product)object;
...

I am experimenting with cryptography and I was wondering if somebody has some suggestion how I could improve my code and methodology.

I want my process to generate more securely the cryptography...

It is isolated code.
It is not used, but i don't understand the code itself and why someone would write it like this.

My predecessor (a very experienced Java programmer who has left) has written Java code and I don't understand why he did it that way. Does anyone have an idea when you would like to do something like...

Why does this work:


public class demo {
static int a;
public static void main(String args[]) {
System.out.println(a);
}

}

private static void staticMethod() {
System.out.println("static method");
}

Is there a difference between calling a static method like:

without class name

staticMethod();

What is a shop requirement?

Why would one initialize an array like:

int arr[] = new int[] {1,2,3,4};

Instead of:

int arr[] = {1,2,3,4};

Very often I see in Java code a constructor been used instead of void setColor() method for example.
Why would somebody do this?

So why doing this:

public class Dog {
String color;
...

Bellow I have some code and I was interested in understanding why this method works when it is static? I expected the opposite


public class demo {
int no;

demo(int no){
this.no=no;
}

What does this mean?



static {
cache = new Cache();
}

Does using Final (I know that the final keyword is used as a constant) makes the execution of my code faster?

For example:
int var1 = 98;
versus
final int var1 = 98;

Or is there no...

What should I use instead?

I have the code bellow and I get as output:
30.299999999999997
30

Why is the output:30.299999999999997 and not 30.3?


public class demo {
private static double som(double a, double b) {...