Java - All Elements in List Become Identical -

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i'm having trouble using loop assign elements list. here's section of code i'm having trouble with:

private static list<string[]> modify(list<string[]> data) {     list<string[]> data2 = new arraylist<>();     (int i=0; i<data.size(); i++) {         string[] block = data.get(i);         // code here modify contents of block         data2.add(block);     }     return data2; }

for reason, method returns list elements identical. i've tried outputting list elements see happening, , seems happening outside of loop. example, this:

private static list<string[]> modify(list<string[]> data) {     list<string[]> data2 = new arraylist<>();     (int i=0; i<data.size(); i++) {         string[] block = data.get(i);         // code here modify contents of block         data2.add(block);         system.out.println(arrays.tostring(data2.get(i));     }     return data2; }

displays list of different elements, whereas this:

private static list<string[]> modify(list<string[]> data) {     list<string[]> data2 = new arraylist<>();     (int i=0; i<data.size(); i++) {         string[] block = data.get(i);         // code here modify contents of block         data2.add(block);     }     (int i=0; i<data2.size(); i++) {         system.out.println(arrays.tostring(data2.get(i)));     return data2; }

displays list consisting of identical elements. seems me elements being correctly added list inside of loop, yet end becoming identical. why this, , how can fix it?

you should make temporary string manipulations, initialize string array, fill data , pass data2 this:

private static list<string[]> modify(list<string> data) {     list<string[]> data2 = new arraylist<>();     (int i=0; i<data.size(); i++) {         string tempstring = data.get(i);         string[] block = new string[255];         // code here modify contents of block         // fill block data         block.add("modified data");         block.add("more manipulated data");         data2.add(block);     }     return data2; }

edit should fix no compiling problem!


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