java interview questions on strings

-threaded access to shared resources, due to improper access, usually a thread locked a resource A, but also want to lock resource B, and in another thread, the lock resource B, but also to lock resource A to complete its own operations, two threads want the other's resources, Instead of releasing their own resources, two of threads are waiting for a situation that cannot be performed.Java Network Programming approximate process:UDP programmingSend side:1, create the Socket object constructor Da

rewrite the aof file, the performance impact of this persistence is minimal, but the aof file will continue to grow, aof file over the General Assembly to affect the recovery speed of master restart. Master should not do any persistent work, including memory snapshots and aof log files, in particular, do not enable memory snapshots to persist, if the data is more critical, a slave open aof backup data, the policy is synchronized once per second. Master calls bgrewriteaof rewrite aof file, a

many occurrences in the array are greater than half @Test public void Test () {int[] num = {1,2,2,2,2,2,2,4,2,4,6,4,2,6,8,2,7,7}; SYSTEM.OUT.PRINTLN (Morethanhaft (num)); } public int morethanhaft (int[] num) {int result =-1; int times = 0, for (int i=0;iTopic Eight:Determines whether an array is the stacking order of another stack @Test public void Test () {int[] num = {1,2,3,4,5};//int[] num1={1,2,3,5,4}; int[] num2={2,1,5,3 , 4}; stackTopic Nine:Draw 5 cards from poker, 0

Panax Notoginseng , the following statement altogether created how many objects:strings= "a" + "B" + "C" + "D";Answer: For the following code:STRINGS1 = "a";STRINGS2 = S1 + "B";STRINGS3 = "a" + "B";SYSTEM.OUT.PRINTLN (s2== "AB");system.out.println (s3== "AB"); The first statement prints the result false The second statement prints the result of true javac compilation can be optimized for expressions that add directly to string constants without having to wait for the runtime

connection is simple and stateless; The HTTPS protocol is a network protocol built by the SSL+HTTP protocol for encrypted transmission and authentication, which is more secure than the HTTP protocol. HTTP uses port 80 by default, HTTPS uses 443 port by default How HTTPS ensures the security of data transmissionHTTPS is actually in the TCP layer and the HTTP layer between the SSL/TLS to secure the upper layer, the main use of symmetric encryption, asymmetric encryption, certificates, an

implementation of this method is actually the same as the first kind! The following is the official Apache Swapcase Method. /** * * Lower case, and lower case to upper case. * * * * * * * * * A {@code null} input String returns {@code null}. * * * Stringutils.swapcase (null) = null * Stringutils.swapcase ("") = "" * Stringutils.swapcase ("the Dog has a BONE") = "the dog has a BONE" * * * * It no longer performs a word