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Is there an easy way(instead of hard coding) to display intermidiate calculation in java?
For example: x+y*3= 10+15*3=55
I have searching for an answer without success.
You could do something like this -
public static void main(String[] args) {
int x = 10;
int y = 15;
System.out.printf("x+y*3 = %d+%d*3 = %d", x, y, (x + (y * 3)));
}
Which outputs
x+y*3 = 10+15*3 = 55
here.
Try to learn parsing strings as shown here: http://www.javapractices.com/topic/TopicAction.do?Id=87
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I want the percentage from the difference of 2 ints, the way packetloss is measured as an example, if int i= 10 and int t=4 the percentage is 60%.
This is simple mathematics .
Int i=10;
Int t=4;
Float prctng=((i-t)/i )*100;
Like this.
((packetSend - packetReceive) * 100) / packetSend
So if i have well understood, you want the normalized distance between the two ints?
int a = 10;
int b = 4;
int distance = (int) 100 * (Math.abs(a-b)/Math.max(a,b)); // = 60
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Please could you tell me how its work in section (g[ss[i]]++;) and tell me the sequence of output in java
class A{
public static void main(String []a){
int []ss={1,2,3,4,2,3,3,1,1,1,5,6,4,5,4};
int []g=new int[15];
for(int i=0;i<15;i++){
g[ss[i]]++;
}
for(int i=1;i<15;i++){
System.out.println(ss[i-1]+"=="+g[i]);
}
}
}
Can't you run it?
g[ss[i]]++; can be rewritten as
int index = ss[i];
g[index] = g[index] + 1;
So it's counted number of each number in ss.
It's very error prone, and you should never do something like that.
Just run it?
1==4
2==2
3==3
4==3
2==2
3==1
3==0
1==0
1==0
1==0
5==0
6==0
4==0
5==0
This should be your output.
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I'm writing a basic GUI for practice, and I want to include an image, and after double-checking all of my code, there remains a NullPointerException when I run it.
Image i;
ImageIcon ii;
...
public Pnl() {
BorderFactory.createLineBorder(Color.BLACK, 5);
setBackground(Color.GREEN);
x = 10;
y = 10;
ii = new ImageIcon(this.getClass().getResource("shrek.jpg"));
i = ii.getImage();
setDoubleBuffered(true);
timer.start();
} // end of constructor
EDIT: The NPE occurs in the line where I initialize the ImageIcon
Check the documentation for "getRecource(..)":
http://docs.oracle.com/javase/6/docs/api/java/lang/ClassLoader.html#getResource(java.lang.String)
A URL object for reading the resource, or null if the resource could not be found or the invoker doesn't have adequate privileges to get the resource.
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I have geo-coordinates in a String like the one given below.
[79.9016492,6.8632761]
I need to get the two numbers separated as double values. Can someone please help me with writing a regular expression?
For [79.9016492,6.8632761] string, it is
String[] oxoy = "[79.9016492,6.8632761]".split("[\\[\\],]");
String x = oxoy[1]; // 79.9016492
String y = oxoy[2]; // 6.8632761
Ideone DEMO
Convert to double
Double x1 = Double.valueOf(x);
Double y1 = Double.valueOf(y);
Not exactly regex, but you can get it very easily as follows:
String[] a = "[79.9016492,6.8632761]".split(",");
double x = Double.valueOf(a[0].substring(1));
double y = Double.valueOf(a[1].substring(0,a[1].length()-1));
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How would I use multidimensional arrays to store an x and y coordinate and the value that should be displayed at that coordinate. The swing tutorial really confused me and im not sure if you can read them the same way as a normal array. Here are my previous attempts:
private int[][][] idXY = new int[1000][1000][2];
int id;
public int[][] idPos(int x, int y){
return idXY[x][y][id];
}
public void setID(int x, int y, int ID){
idXY[x][y][ID] = {x}, {y}, {ID};
}
Im very sure that code doesn't make sence XD.
Thanks for your help,
AidoP
This is the syntax to store a value to a multidimensional array:
array[x][y] = value;
To access it:
array[x][y];
System.out.println(array[x][y]); // as an example