java array 问题

下面系条件 用one-dimensional array
Array name: dblScore
~Data type: double
~ Size: 10 elements
~ Values: un-initialized
我咁样写
public class Lab5 {
public static void main(String[] args) {
double[] array = new double [10];
System.out.println("Index/dblScore");
for( int i=0; i<array.length; i++)
System.out.println(i + "\t" + array );
}
}

但系output出
Index/dblScore
0 0.0
1 0.0
2 0.0
3 0.0
4 0.0
5 0.0
6 0.0
7 0.0
8 0.0
9 0.0
咁样咪唔符合Values: un-initialized
咁我应该点写??

唔明你点解未initialize都要print out佢...

Fine, 首先if你唔init佢at code level, Java compiler 系会initialize double 做 0 (depends on compiler,但多数都系0)如果你真系要睇到唔init同init左既分别(null& !null既分别),你应该用wrapper type: Double,而唔系double.



public class Lab5 {
public static void main(String[] args) {
Double[] array = new Double [10];
System.out.println("Index/dblScore");
for( int i=0; i<array.length; i++)
System.out.println(i + "\t" + array[ i ]);
}
}
Result:Index/dblScore
0 null
1 null
2 null
3 null
4 null
5 null
6 null
7 null
8 null
9 null

[ 本帖最后由 笨木 於 2013-10-29 10:02 AM 编辑 ]