java中字符串和整数相互转换

字符串转换为整数：

    public static void main(String[] args) {
        String test = "445";
        int number = Integer.parseInt(test);
        System.out.println(number);
    }

    public static void main(String[] args) {
        String test = "445";
        int number = Integer.valueOf(test);
        System.out.println(number);
    }

如果输入的字符串中不是有效的整数时，会出现java.lang.NumberFormatException:异常：

    public static void main(String[] args) {
        String test = "过河";
        int number = Integer.valueOf(test);
        System.out.println(number);
    }

异常信息：

Exception in thread "main" java.lang.NumberFormatException: For input string: "过河"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Integer.parseInt(Integer.java:580)
    at java.lang.Integer.valueOf(Integer.java:766)
    at com.mmall.util.PropertiesUtil.main(PropertiesUtil.java:41)

---

整数转为字符串：

    public static void main(String[] args) {
        int number = 445;
        String test = Integer.toString(number);
        System.out.println(test);
    }

    public static void main(String[] args) {
        int number = 445;
        String test = String.valueOf(number);
        System.out.println(test);
    }