https://blog.csdn.net/sunroyfcb/article/details/89710553
String与Int类型转换:Integer.parseInt(String a);
String与Long类型转换:Long.parseLong(String a);
jdk版本不支持switch字符串类型:https://blog.csdn.net/qiqibei666/article/details/103486771
后人乘凉~嘿嘿,感谢~