public void processData() {
int count = 0; // Stack
String name = "Java"; // Heap
List<String> items = // Reference on Stack
new ArrayList<>(); // Object on Heap
items.add(new String("Item")); // Object on Heap
}
節省記憶體的程式寫法
// Inefficient
List<String> list1 = new ArrayList<>();
for (int i = 0; i < 1000; i++) {
String s = new String("value"); // 1000 objects
list1.add(s);
}
// Better
List<String> list2 = new ArrayList<>();
String s = "value"; // Single object
for (int i = 0; i < 1000; i++) {
list2.add(s);
}
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