I want add item at the top of array?
how can i achieve this?
there are two item in array. i want to add item at top of the array.
result1 = new String[result.length+1];
for(int i=result.length;i==0;i--)
{
if(i==0)
{
result1[0]="Latest";
}
result1[i]=result[i-1];
}
To answer your question: You need to
"latest" into the new array:Like this:
String[] result = { "a", "b", "c" };
String[] tmp = new String[result.length+1];
System.arraycopy(result, 0, tmp, 1, result.length);
tmp[0] = "latest";
result = tmp;
But, I encourage you to consider using a List such as ArrayList in which case you could express this as
result.add(0, "latest");
You can't : an array has a fixed length.
If you want to have variable size "arrays", use ArrayList.
Exemple :
ArrayList<String> list = new ArrayList<String>();
list.add("a");
list.add("b");
list.set(0, "new a");
for (String s: list) {
System.out(s);
}
But you can use ArrayList and with add(int index, E object) function you can add items wherever you want. And you can convert ArrayList to array[] easly
Use stack which works as LIFO (Last In First Out), hence whenever you pop (read) you will get the latest(at the top) pushed item
Here is the Java code reference using Array: http://wiki.answers.com/Q/Implementing_stack_operation_using_array_representation_with_java_program
One problem with your solution is that when i == 0, you set the value to Latest but the value is overwritten after with result1[i]=result[i-1];
Try
if(i==0) {
result1[0]="Latest";
}
else {
result1[i]=result[i-1];
}
"Latest"