Java Learning-3 string char char[] int cross-transfer

1. String------>int

1.1 "123"-----> 1, 2, 3

Method 1:

string s =new string (); s= "123"; int i=integer.parseint (s.substring (0,2))//  int i=123int i=integer.parseint ( S.substring (0,1))//  int i=12int i=integer.parseint (s.substring)//  int i=23int i=integer.parseint ( S.substring (0,0))//  int I=1

int I=integer.parseint (s.substring (0,0))//  int I=1

Method 2:

String is converted to char[] and converted to int, which is no longer detailed

　　

1.2 "123"------> 123,

string s =new string (), s= "123", int i=integer.parseint (s.substring (0,2))//int i=123 in the case of no more than int value range  

　　

2,string--------->char[]

string s =new  string (); s= "123"; Char [] d;d=S.tochararray (); System.out.println (d[1]);

3,char------->int

String s =new= "12345"        ; int i; // i= integer.valueof (s,3); Char [] d;d=S.tochararray (); System.out.println ((int) (d[4]-48));

4,int---------->char

int A=1

Char b= (char) (a+48)

5,int-------->string

int A=1

Char b= (char) (a+48)

Stringc= b+b+b;

Dierzhon

1 "string.valueof (i)
2 "integer.tostring (i)
3 "i+" "

6,int---->char[]

int a = 12345;

Java Learning-3 string char char[] int cross-transfer