Common in Java class libraries
The Common class in the Java class library is one of the commonly used tool classes in Java development. It provides many universal functions and methods that can be used to simplify code writing and accelerate development speed.
Here are some commonly used methods and sample codes for the Common class:
1. String processing method:
1.1. Determine whether the string is empty:
String str = "Hello, World!";
if (Common.isEmpty(str)) {
System. out. println ("string is empty");
} else {
System. out. println ("string is not empty");
}
1.2. Remove spaces from strings:
String str = " Hello, World! ";
String trimmedStr = Common.trim(str);
System.out.println(trimmedStr);
2. File operation method:
2.1. Create File:
String filePath = "/path/to/file.txt";
Common.createFile(filePath);
2.2. Read File Content:
String filePath = "/path/to/file.txt";
String content = Common.readFile(filePath);
System.out.println(content);
3. Time processing method:
3.1. Obtain the current date and time:
String currentDate = Common.getCurrentDate();
String currentTime = Common.getCurrentTime();
System. out. println ("current date:"+currentDate);
System. out. println ("current time:"+currentTime);
3.2. Format Date and Time:
String formattedDate = Common.formatDate(new Date(), "yyyy-MM-dd");
String formattedTime = Common.formatTime(new Date(), "HH:mm:ss");
System. out. println ("Formatted Date:"+FormattedDate);
System. out. println ("Formatted Time:"+FormattedTime);
4. Digital processing methods:
4.1. Convert a string to an integer:
String numStr = "12345";
int num = Common.parseInt(numStr);
System. out. println ("Converted integer:"+num);
4.2. Generate random numbers within the specified range:
int min = 1;
int max = 100;
int randomNum = Common.getRandomNumber(min, max);
System. out. println ("generated random number:"+randomNum);
The above is only a small part of the functionality and sample code provided by the Common class. In fact, the Common class in the Java class library also contains many other useful methods that can be consulted and used according to specific needs.
In short, the Common class is a very practical tool class that can simplify Java code writing and improve development efficiency by using it.
