what is java deployment toolkit

Often listen to friends say what Java EE, finally know what is the Java EE, Khan, the Internet search the next this said more detailed, J2EE,JAVA2 Platform Enterprise Edition (Java 2 Platform Enterprise Edition), It

Serialization is a mechanism for dealing with the flow of objects, so-called object flow is the flow of the object's contents. CanRead-write operations are performed on the convective objects, and the streamed objects can be transferred between the networks. Serialization is to solveThe problem that is raised when read

Java technology _ Java 0021 _ What is an exception in java?1. What is a java exception? java ha

Anyone who learns Java knows that void means null and is a keyword in java. Initially, when I knew void, it was public static void main (String[]args) {}, I remember when I was in contact with void, I always had no idea what it was, so I asked the teacher, butThe teacher just said void

What is Reflection (Reflection). The main point is that the program can access, detect and modify its own state or behavior of a capability of Java reflection. In the Java Runtime environment, for any class, you can tell what p

What Web Projects do PHP and Java do with thrift, and what Server software is available to run them after communication? Reply content: What Web Projects do PHP and Java do with thrift, and

Java basic questions: What are the similarities and differences between runtime exceptions and general exceptions? What is the difference between error and exception? Please write the five most common runtimeexception ?, ThrowableIt is the parent class for

Space is not enough, this time will certainly trigger YGCFor FGC trigger timing, old space shortage, and perm space, call System.GC () These are more obvious, that is, in this case, the general will trigger GC.The most complex is the so-called pessimistic strategy, which triggers the mechanism is to first calculate th

");------------ When the value is =null, a null pointer exception is thrown and the S1.equals ("Sky") is changed to "Sky". Equals (S1) to avoid throwing exceptions6. Empty string and Null difference　　TypeNull represents the value of an object, not a string. For example, declaring a reference to an object, String a = null;"" represents an empty string, meaning tha

IO has been one of the core parts of software development, and with the improvement of Internet technology, IO is becoming more and more important. Throughout the development community, the ability to skillfully use IO is important not only for companies but also for developers. Java's IO mechanism is constantly being perfected to cope with increasing traffic.

The error class object is generated and thrown by the Java virtual machine, and the exception class object is generated and thrown by the application.ProgramProcess or throwError indicates that recovery is not a serious problem that is impossible but difficult. For example,

Final Class A {}, so that the defined Class A is the final class, the final class cannot be inherited, that is, the code cannot be written, class B extends a {}.final void B () {}, the method defined is the final method, and the final method cannot be overridden in a subclass, that is, if a subclass inherits the class

There are 8 basic types of data in Java:Integer type: Byte (8), short (16), int (32), Long (64)Float type: float (32), double (64)Character type: char (16-bit Unicode character)Boolean type: BooleanAuto-unboxing is supported after jdk1.5Auto-Boxing is a conversion of the Java compiler between the base data type and the corresponding object wrapper type. Automatic