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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

");------------ 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.

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

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

What is the mechanism for implementing polymorphism in java ?, Java Implementation polymorphism Mechanism Polymorphism is an important mechanism for object-oriented programming code reuse. We have mentioned Java polymorphism more

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

Java technology is not only a programming language but also a platform. While the Java language is an advanced object-oriented language with a specific syntax and style, the Java platform is the environment in which a particular a

Java technology is not only a programming language but also a platform. While the Java language is an advanced object-oriented language with a specific syntax and style, the Java platform is the environment in which a particular a

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,

The first thing to know is what the so-called Java NIO is!IO is transmitted by character or byte, slower! And NiO is a block, it's equivalent to a buffer, a piece ofTransmission, faster！ Multiple threads are also addedControl, a N

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