String和各类型转换

int   i   =   10; 
double   j=1.0; 
//Integer转化成字符串
String   str_i=Integer.toString(i); 


//DOUBLE转化成字符串
或String   str_j   =   Double.toString(j); 
或String   str_j   =    String.valueOf(j);




//字符串转化成DOUBLE
double   dd   =   Double.valueOf( "123.2 ");
或double   dd   =   Double.parseDouble( "123.2 ");