java quick reference

J2SE quick advanced -- Java memory analysis, j2se advanced java Program Execution Process To analyze the memory in Java, let's first take a look at the program execution process: As shown in, there are roughly three steps: 1. At the beginning, our program exists in the hard disk. When it is started and running, the p

shorter life cycle. As the garbage collector thread scans the area of memory it governs, once an object with only a weak reference is found, its memory is reclaimed, regardless of whether the current memory space is sufficient or not. However, because the garbage collector is a low-priority thread, it is not necessarily quick to discover objects that have only weak references. The Weak

Document directory (1) do not explicitly call system. GC () (2) minimize the use of temporary objects (3) it is best to explicitly set the object to null when it is not used. (4) Try to use stringbuffer instead of string to accumulate the string (For details, refer to the string and stringbuffer in another blog article in Java) (5) You can use basic types such as int and long to remove integer and long objects. (6) Use as few static object var

JAVA object reference, object assignment (conversion), and java assignment Link: http://zwmf.iteye.com/blog/1738574 Keywords: java object referenceJava object and its referenceSome basic concepts about objects and references.When I was a beginner in Java, I thought the basi

of the equals sign. New is to open up space for objects in memory. Specifically, new is a space for objects on the heap of memory (heap). In this space, the data and methods of the object are saved. Look at the left side of the equals sign again. Aperson refers to a human object, called an object reference (reference). In fact, Aperson is not the object itself, but rather a pointer to an object. The Ap

Java basics: whether to pass the value or reference-Linux general technology-Linux programming and kernel information. The following is a detailed description. 1. Simple types are passed by value When Java method parameters are of simple type, they are passed by value ). This can be illustrated through a simple example: /* Example 1 */ /** * @ (#) Test.

) with the first array element as the key data, assigned to X, that is, X:=a[1], 3), starting from J forward search, that is, from the beginning of the forward search (j:=j-1), Find the first value less than X, Exchange the two; 4), search backwards from I, that is, start backward search (i:=i+1), find the first value greater than X, Exchange 5), repeat steps 3rd and 4 until i=j; */public class QuickSort {public static void Main (string[] args) {int[] Source = {49, 38, 65, 97, 76, 13, 27}; Syste