You need to initialize marks array.
int[] Math = {85,65,40,20};
int[] English = {35,55,68,75};
int[] ICT = {50,35,69,95};
int i;
int x=1;
int[] marks = new int[4];
if (x==1) {
marks=Math;
}
else if (x==2) {
marks=English;
}
else if (x==3) {
marks=ICT;
}
for (i=0; i<4; i++ )
{
System.out.print(marks[i] + " ");
}
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solved Copy array to another empty array in java