How to exceed 65535 byte limit for method code

问题:

I have a product list but Java complains that the method exceeds the limit of 65535 bytes. How can I add more words and overcome the limit?

public class ProductList extends Activity {     // List view private ListView lv;  // Listview Adapter ArrayAdapter<String> adapter;  // Search EditText EditText inputSearch;  // ArrayList for Listview ArrayList<HashMap<String, String>> productList;   /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_product_list);       String as = System.getProperty("line.separator");      String products[] = {               // I want these words to keep in a database             // Because here is 65kb limit but I need more...                "Banana"    +as+    "Its color is yellow."  ,             "Orange"    +as+    "Orange is a sour fruit."   ,             "Onion" +as+    "Onion usually used on Pizza"   ,             "Google"    +as+ "Google is a giant search engine." ,             "Love"  +as+    "Love is related to heart." ,             "Lily"  +as+    "It  is one kind of white flower."  ,             "Banana"    +as+    "Its color is yellow."  ,             "Orange"    +as+    "Orange is a sour fruit."   ,             "Onion" +as+    "Onion usually used on Pizza"   ,             "Google"    +as+ "Google is a giant search engine." ,             "Love"  +as+    "Love is related to heart." ,             "Lily"  +as+    "It  is one kind of white flower."  ,                        "Banana"    +as+    "Its color is yellow."  ,             "Orange"    +as+    "Orange is a sour fruit."   ,             "Onion" +as+    "Onion usually used on Pizza"   ,             "Google"    +as+ "Google is a giant search engine." ,            };        lv = (ListView) findViewById(R.id.list_view);     inputSearch = (EditText) findViewById(R.id.inputSearch);      // Adding items to listview     adapter = new ArrayAdapter<String>(this, R.layout.list_item, R.id.p_list,   products);     lv.setAdapter(adapter);      /**      * Enabling Search Filter      * */     inputSearch.addTextChangedListener(new TextWatcher() {          @Override         public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {             // When user changed the Text             ProductList.this.adapter.getFilter().filter(cs);         }          @Override         public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,                 int arg3) {             // TODO Auto-generated method stub          }          @Override         public void afterTextChanged(Editable arg0) {             // TODO Auto-generated method stub         }     });   }  } 

For easier understanding:

Thanks in advance

回答1:

This isn't a limitation to do with Sqlite as far as I can tell - the Eclipse error is showing that it's a problem with the method.

I would strongly suggest that if you have a lot of data, you should keep that in a separate resource. Then just load the resource at execution time. There's no need to have it baked into your code. You can always include some string to replace with the platform line separator if you need to.

回答2:

You're allocating that array on the stack, and the stack usually has a 64kb limit in how much it can hold.

Your solution is to use the heap. If you changed your code to be

// allocate an array on the heap ArrayList<String> products = new ArrayList<String>(); products.add("Banana" +as+ "Its color is yellow."); products.add("Orange" +as+ "Orange is a sour fruit."); products.add("Onion" +as+ "Onion usually used on Pizza"); // etc 

Then I bet that would work.

Your best option, however, is to do what Jon Skeet said and store all that data in a resource and load it when you need it. Since it looks like you're using Android, I would suggest using String Arrays, which is how you're supposed to handle this type of data.

UPDATE:

Interesting. So it turns out that this is a Java limitation. See this answer. My understanding is that the jump offsets in class files are 16-bit, which means that methods can be, at most, 65535 bytes in size.

So the hack solution is to split this into smaller methods:

// allocate an array on the heap ArrayList<String> products = new ArrayList<String>(); addFirstThousand(products); addSecondThousand(products); // etc.  private void addFirstThousand(ArrayList<String> products) {     products.add("Banana" +as+ "Its color is yellow.");     products.add("Orange" +as+ "Orange is a sour fruit.");     products.add("Onion" +as+ "Onion usually used on Pizza");     // etc } 

But that is a terrible idea. It really would be better to put those strings in some sort of data file and then load it at runtime. If for some reason you're really opposed to doing the right thing and using the String Array that Google has provided you, then you could also just put those strings in a text file in assets, and read it in through the normal Java BufferedReader.

回答3:

The solution is to allocate objects dynamically into the heap, which is virtually infinite.

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