字符串和整形、浮點類型的相互轉化

字符串轉化爲整形、浮點類

String str = "1";
float f = Float.parseFloat(s);
double d = Double.parseDouble(s) ;

整形、浮點類型轉化爲字符串

int i =1;
float f = 1;
double d = 1;
String s1,s2,s3;
s1=i+"";
s2=f+"";
s3=d+"";