A Data Type Range
Second, the eight kinds of data type defaults in the member variables
(1) member variables, no assignment, the compiler does not complain, the system will automatically assign to
byte \ int \ short \ long default value is 0; float \ double default value is 0.0; boolean default is false; char default value \ u0000
Summary: All in line to zero
(2) local variable, not directly assigned if the compiler will complain
public class D10 { static int I = 100 ; static int a; // this is the member variables, no assignment, the compiler is not given, the system will automatically assign to a public static void main (String [] args) { // int B ; // this is a local variable, if there is no assignment error will be compiled directly // System.out.println (B); System.out.println (I); System.out.println (A); } }
Third, escapes
After 1.print represents the output does not wrap, and then println represents the output line feed
2. escape character, the backslash is an escape role in java
\ N represent the newline; \ T represents a tab character;
public class d10_2_transferred_meaning_character { public static void main (String [] args) { char C1 = 'A' ; System.out.println (C1); of System.out.print (C1); // after the print line represents the output does not change, and println output representative of line breaks after char C2 = '\ n'; // escape character, \ n represents the newline backslash is the escape role in java System.out.println (C2); char C3 = '\ T' ; of System.out.print (C3); } }
Fourth, the source code:
d10_data_type_default_value.java
d10_2_transferred_meaning_character.jav
https://github.com/ruigege66/Java
2.CSDN: https: //blog.csdn.net/weixin_44630050 (Xi Jun Jun Moods do not know - Rui)
3. Park blog: https: //www.cnblogs.com/ruigege0000/
4. Welcomes the focus on micro-channel public number: Fourier transform, backstage reply "gifts" to get big data learning materials
