non null array length
public static <T> int getLength(T[] arr){
int count = 0;
for(T el : arr)
if (el != null)
++count;
return count;
}
// equivalently in pure C# :
public static int getUsedLength(string[] arr)
{
int count = 0;
for (int i = 0; i < arr.Length; i++)
{
if (arr[i] != null)
{
++count;
}
}
return count;
}java check if array element is null
public class test {
public static void main(String[] args) {
Object[][] someArray = new Object[5][];
someArray[0] = new Object[10];
someArray[1] = null;
someArray[2] = new Object[1];
someArray[3] = null;
someArray[4] = new Object[5];
for (int i=0; i<=someArray.length-1; i++) {
if (someArray[i] != null) {
System.out.println("not null");
} else {
System.out.println("null");
}
}
}
}
$ /cygdrive/c/Program Files/Java/jdk1.6.0_03/bin/java -cp . test
not null
null
not null
null
not nullCopyright © 2021 Codeinu
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