逃逸剖析

public static StringBuffer craeteStringBuffer(String s1, String s2) {
    StringBuffer sb = new StringBuffer();
    sb.append(s1);
    sb.append(s2);
    return sb;
}

public static String createStringBuffer(String s1, String s2) {
    StringBuffer sb = new StringBuffer();
    sb.append(s1);
    sb.append(s2);
    return sb.toString();
}public static StringBuffer craeteStringBuffer