java 几种类型之间的转换

char[] a =b.toCharArray();

a 定义的目标数组

b String类型参数

打印 a[i]

i为任意数~从0开始~

 

其他类型转换：

string->int

1). int i = Integer.parseInt([String]); 或
i = Integer.parseInt([String],[int radix]);

2). int i = Integer.valueOf(my_str).intValue();

int->string

1.) String s = String.valueOf(i);

2.) String s = Integer.toString(i);

3.) String s = "" + i;

string->byte
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
Short static Short parseShort(String s)

Short->String
Short static String toString(Short s)

String->Integer
Integer static int parseInt(String s)

Integer->String
Integer static String tostring(int i)

String->Long
Long static long parseLong(String s)

Long->String
Long static String toString(Long i)

String->Float
Float static float parseFloat(String s)

Float->String
Float static String toString(float f)

String->Double
Double static double parseDouble(String s)

Double->String
Double static String toString(Double d）