String

int id;
String strId;

// i2s
strId = String.valueOf(id);

// s2i
id = Integer.valueOf(strId);

byte[] bytes;
String strSrc = "test";
String strDest;
// s2b
bytes = strSrc.getBytes();
// b2s
strDest = new String(bytes);

public byte[] toByteArray() {
        byte[] bytes = new byte[mSignature.length]; //private final byte[] mSignature
        System.arraycopy(mSignature, 0, bytes, 0, mSignature.length);
        return bytes;
    }

str1.equals(str2);

            public class XMLBuilder {
                public static String buildXML(PlayerCount player) {
                    StringBuilder builder = new StringBuilder();
                    builder.append("<root>");
                    builder.append("<server>").append(player.getServerName()).append("</server>");
                    builder.append("<player_count").append(player.getPlayerCount()).append("</player_count>");
                    builder.append("</root>");
                    return builder.toString();
                }
            }