Java regular expression
Please refer to the tutorial: http://c.biancheng.net/view/5812.html
public static void main(String[] args) {
String regex = "^\\w+[@].*\\.((com)|(cn))(\\.com|\\.cn)?";
String b = "[email protected]";
//还可以使用Pattern和Matcher,他们有很多方法，可参考https://www.runoob.com/java/java-tutorial.html
//Pattern p = Pattern.compile(regex);
//Matcher m = p.matcher(b);
//System.out.println(m.matches());
System.out.println(b.matches(regex));
}
Why Java regex requires two slashes
Online regular expression-regex100.com
Java: LocalDate, LocalDateTime, Date and timestamp conversion
LocalDate, LocalDateTime, Date and timestamp conversion
localDateTime gets the time specified date format
Convert object array to character array in java
Object[] obj= {
"a","b","c"};
String[] stringArray = Arrays.stream(obj).toArray(String[]::new);
String[] stringArray = Arrays.copyOf(obj, obj.length, String[].class);
String[] stringArray = Arrays.asList(obj).toArray(new String[obj.length]);
java enumeration constructor
The number of calls to the java enumeration constructor. The number of
calls to the java enumeration constructor. Reference 2
Reference 3
//自定义构造器的枚举
public enum Role {
ROLE_PERSONAL("personal","个人"),
ROLE_MANAGER("manager","单位"),
ROLE_DIVISION("division","主管"),
ROLE_UNDEFINED,//可以有参无参混合用，但是这种混合需要手动声明无参构造
;
private String roleCode;
private String roleName;
Role() {
}
Role(String roleCode, String roleName) {
this.roleCode = roleCode;
this.roleName = roleName;
}
public String getRoleCode() {
return roleCode;
}
public void setRoleCode(String roleCode) {
this.roleCode = roleCode;
}
public String getRoleName() {
return roleName;
}
public void setRoleName(String roleName) {
this.roleName = roleName;
}
}