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DOUBLEdouble   dd   =   Double.valueOf( "123.2 ");或double   dd   =   Double.parseDouble( "123.2 ");