How to import other person's package? - import

Question

import CtCILibrary.*;
public class RotateMatrix {
public static boolean rotate (int [][]matrix) {
if ( matrix.length == 0 || matrix.length != matrix[0].length) {
return false;
}
int n = matrix.length;
for ( int layer = 0 ; layer < n / 2 ; layer++ ) {
int first = layer;
int last = n - 1 - first;
for ( int i = first ; i < last; i++ ) {
int offset = i - first;
int top = matrix[first][i];
//left-> top
matrix[first][i] = matrix [last-offset][first];
//bottom -> left
matrix[last-offset][first] = matrix [last][last-offset];
//right -> bottom
matrix[last][last-offset]= matrix[i][last];
//top->right
matrix[i][last]=top;
}
}
return true;
}
Hi there, I'm trying to import the CtCI library to solve the problem but there's an error message. And from her GitHub, that was how she imported this class. I know we can import the class from java built-in library. But I'm not sure how import works when trying to import from someone else. Could someone explain it to me?

Answer 1

If you are doing serious programming for a long term app, and by import you refer to libraries/dependencies, I highly recommend you using maven for it.
If you don't use maven yet, you can just add the .jar files from you IDE to your project path, but with maven is way better.
If you mean importing a .java file written by someone else, to use part of it in your code, just put the file at your project path, you probably need to adapt its libraries and imports, and once ready you can just use its methods ans stuff. Just make sure you have tipped at the top of your current file the import sentence of that file.