Java - Sizuha/devdog GitHub Wiki

public enum ErrorCode { SERVER_CONNECT_ERR, LOGIN_WRONG }

public enum ErrorCode {
        SERVER_CONNECT_ERR(400), LOGIN_WRONG(100);

        private int value;
        private ErrorCode(int value) { this.value = value; }

        public int toInt() { return value; }
}

static <T> void fromArrayToCollection(T[] a, Collection<T> c) {
    for (T o : a) {
        c.add(o); // Correct
    }
}

public class Hoge<T> {
    private T t;
}

public class A {}
public class B extends A {}
public class C extends B {}

public class Foo1<T extends B> {} // BやCやその派生

// class&interface[&interface[...] ]
public class Bar<T extends B & java.io.Serializable> {}

Hoge<?> hoge = new Hoge<String>();
Hoge<? extends A> a = new Hoge<B>();

    String request_get(String url, List<NameValuePair> params) {
        HttpClient httpclient = new DefaultHttpClient();
        String content;

        try {
            if (params != null && params.size() > 0) {
                boolean first = true;
                String param_str = "?";

                for (NameValuePair nv : params) {
                    param_str += (first ? "" : "&") + nv.getName() + "=" + nv.getValue();
                    first = false;
                }

                URLEncoder.encode(param_str, "UTF-8");
            }

            HttpGet httpget = new HttpGet(url);
            HttpResponse response = httpclient.execute(httpget);

            content = EntityUtils.toString(response.getEntity());
        }
        catch (IOException e) {
            content = null;
        }

        return content;
    }

    String request_post(String url, List<NameValuePair> params) {
        Response result = new Response();
        String content;

        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(url);

        try {
            if (params != null && params.size() > 0) {
                httppost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
            }

            // Execute HTTP Post Request
            HttpResponse response = httpclient.execute(httppost);

            content = EntityUtils.toString(response.getEntity());
        }
        catch (ClientProtocolException e) {
            content = null;
        }
        catch (IOException e) {
            content = null;
        }

        return content;
    }

(Argument List) -> body

(int x, int y) -> x + y
() -> 42
(String s) -> { System.out.println(s); } // return이 없는 경우.

//인자의 타입을 생략할 수도 있다.
(x, y) -> x + y
s -> { System.out.println(s); }

InetAddress.getByName("xxxx.yyy.com").getHostAddress();

    // for Android
    public void selectFragment (MainMenu mainMenu){
        int position = mainMenus.indexOf(mainMenu);
        onNavigationDrawerItemSelected(position);
        setTitle(mainMenus.get(position).getName());

        Fragment fragment = null;
        try {
            Class<?> fragmentClass = Class.forName(mainMenus.get(position).getClassName());
            fragment = (Fragment) fragmentClass.newInstance();
            replaceFragment(fragment);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (java.lang.InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }

    /**
     * bytesToHex method
     * Found on the internet
     * http://stackoverflow.com/a/9855338
     */
    static final char[] hexArray = "0123456789ABCDEF".toCharArray();
    public static String bytesToHex(byte[] bytes) {
        char[] hexChars = new char[bytes.length * 2];
        for ( int j = 0; j < bytes.length; j++ ) {
            int v = bytes[j] & 0xFF;
            hexChars[j * 2] = hexArray[v >>> 4];
            hexChars[j * 2 + 1] = hexArray[v & 0x0F];
        }
        return new String(hexChars);
    }

    public final static boolean isValidFileName(String filename_without_path) {
        final String[] reservedChars = {"|", "\\", "?", "*", "<", "\"", ":", ">"};

        if (filename_without_path == null || filename_without_path.trim().isEmpty()) return false;

        for (String c: reservedChars){
            if (filename_without_path.indexOf(c) >= 0) return false;
        }

        return true;
    }

@Override
public void onClick(View v) {
    if (v == mBuyButton) {
        if (mManagedType != Managed.SUBSCRIPTION &&
                !service.requestPurchase(mItem, Consts.ITEM_TYPE_INAPP, null)) {
            showDialog(DIALOG_BILLING_NOT_SUPPORTED_ID);
        }
        else if (!service.requestPurchase(mItem, Consts.ITEM_TYPE_SUBSCRIPTION, null)) {
            showDialog(DIALOG_SUBSCRIPTIONS_NOT_SUPPORTED_ID);
        }
    }
}

if (V != C1 && !F(x, 1)) doThen();
else if (!F(x, 2)) doElse();

// 위 코드가...
// 이렇게 해석되면...
if ( V != C1 && !F(x, 1) && F(x, 2) )
	doThen();
else
	doElse();

if (V == C1) {
	if (!F(x, 2)) doThen();
}
else {
	if (!F(x, 1)) doElse();
}