1、从String转换到Double

Double input1 = new Double("56.88");
Double input2 = Double.valueOf("56.88");
Double input3 = Double.parseDouble("56.88");

可以用try catch 捕获异常（NumberFormatException），如果字符串不是有效的Double类型

2、String 转Boolean

Boolean b1 = Boolean.valueOf("false");

3、 Boolean转String

Boolean b1 = new Boolean("false");
String str = Boolean.toString(b1);

4、Double转String

double input = 25.01;
String output = Double.toString(input);

5、String转Long

  Long long1 = new Long("75");

  String str = "79";
  Long long2 = Long.valueOf(str);