Common Java and eclipse operations

Eclipse:

F3 Search Class and Function Definition

CTRL + shft + R find class

 

CTRL + F10 display row number

CTRL + Shift + F Automatic Alignment

CTRL +/comment

Java:

Jar package: manifest-version-specifies the main-class version of the configuration file-specifies the entry class for running the program. Note: Do not add the class extension class-path-after the class name to specify the path of the supported libraries. "." Indicates the program running directory, that is, the directory where the exported jar package is located. When running the program, you can find the supported libraries based on the set path of the Class-path item. Each supported library is separated by a space. Hibernate, spring, and Derby are used here. java-jar ***. jar type conversion int I = integer. parseint ([String]); string S = string. valueof (I); Other Conversions

String-> byte static byte parsebyte (string S)

Byte-> string byte static string tostring (byte B)

Char-> string character static string to string (char C)

String-> short static short parseshort (string S)

Short-> string short static string tostring (short S)

String-> integer static int parseint (string S)

Integer-> string integer static string tostring (int I)

String-> long static long parselong (string S)

Long-> string long static string tostring (long I)

String-> float static float parsefloat (string S)

Float-> string float static string tostring (float F)

String-> double static double parsedouble (string S)