I love the way notepad++ highlights every instance of the selected keyword, something eclipse doesnt do it automatically, to make it do it first select the text then, ALT+SHIFT+O
Means in the color of night. [in Kurdish]
I dump information here for myself or anyone like myself.
Sunday, March 30, 2014
Thursday, March 27, 2014
Final Array vs Final Variable in Java
Final in java means you can not change it after been initialized, but ever noticed , you can change values of a final array but not values of a final variable ?
Why java is okay with final int[] array to be changed but not final int ? the final for Array means , you can not change the reference of the array to another array, but the content of array could be anything, since arrays are passed by reference not by value.but for variable, it is passed by value and u can not change the value .
For example the following example for array will make the compiler yell at us :
for example :
public class UF {
private final int[] nodes;
private final int something=0;
public UF(int n) {
nodes = new int[n]; // perfectly fine
nodes[0]=-1; // perfectly fine
nodes[0]=13; // perfectly fine
something=-1; // ERRR IT IS NOT OKAY
}
Why java is okay with final int[] array to be changed but not final int ? the final for Array means , you can not change the reference of the array to another array, but the content of array could be anything, since arrays are passed by reference not by value.but for variable, it is passed by value and u can not change the value .
For example the following example for array will make the compiler yell at us :
public class UF {but How to make the array values final ? the answer is using umodifiable collections of java
private final int[] nodes;
public UF(int n) {
nodes = new int[n];
int[] test = new int [n];
nodes=test; // ERRRR compiler not happy !!! you are trying to change a final reference to another reference
}
for example :
int[] arr= new arr[5];
Listitems = Collections.unmodifiableList(Arrays.asList(arr));
Labels:
java,
programming
Thursday, March 20, 2014
Arbitrary Number of Arguments in Java
Today I learn a cool tip, three dots in java mean Arbitrary Number of Arguments
for example ,
means any number of AccessPermission arguments could be passed.
for example ,
public SchemeUser(String name, AccessPermission... permArgs) {
//
}
means any number of AccessPermission arguments could be passed.
Labels:
java,
programming
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