importjava.util.Formatter;publicclassMain{publicstaticvoidmain(String[]args){Formatterformatter=newFormatter(System.out);StringformatString="Hello, %s! You are %d years old.";// 使用format()方法生成格式化后的字符串StringformattedString=formatter.format(formatString,"John",25).toString();// 其他代码...
接下来,我们使用Mermaid语法来描述一个输出格式化功能的类图。 OutputFormatter+printWithSpace(String text)+printfFormatted(String format, Object... args)+joinWithSpace(String... strings)+buildStringWithSpace(String... strings) 这个类图展示了一个名为OutputFormatter的类,它包含了几个方法,用于不同的输出格...
The optional precision is a non-negative decimal integer usually used to restrict the number of characters. The specific behavior depends on the conversion. The required conversion is a character indicating how the argument should be formatted. The set of valid conversions for a given argument depen...
"and the string is %s", floatVar, intVar, stringVar); The first parameter,format, is a format string specifying how the objects in the second parameter,args, are to be formatted. The format string contains plain text as well asformat specifiers, which are special characters that format the...
Like C's sprintf(3), Strings may be formatted using the static method String.format: // Format a string containing a date. import java.util.Calendar; import java.util.GregorianCalendar; import static java.util.Calendar.*; Calendar c = new GregorianCalendar(1995, MAY, 23); String s = Str...
The format() method, which DecimalFormat inherits from NumberFormat, is then invoked by myFormatter—it accepts a double value as an argument and returns the formatted number in a string: Here is a sample program that illustrates the use of DecimalFormat: import java.text.*; public class ...
String formatted = String.format(“%s今年%d岁。”, “小李”, 30); // “小李今年30岁。” 不用我多解释,你也可以看出: 这个方法第一个参数是格式串,后面的参数都是格式串的参数,用于替换格式串中的占位符。 占位符以 “%x” 的形式表示,不同的参数类型要用不同的字母。后面会具体介绍。
Like C's sprintf(3), Strings may be formatted using the static method String#format(String,Object...) String.format: <blockquote>// Format a string containing a date. import java.util.Calendar; import java.util.GregorianCalendar; import static java.util.Calendar.*; Calendar c = new Gregoria...
out.println(formattedDateTime); // 输出格式化后的日期时间 解析字符串为日期时间 代码语言:javascript 代码运行次数:0 运行 AI代码解释 String strDateTime = "2023-09-01 12:30:45"; DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"); LocalDateTime parsedDateTime = ...
out.println(formattedDate); // 格式化后的日期 } } (二)、现代 API (java.time) Java 8 引入了新的日期和时间 API,大大简化了日期和时间的处理,并提高了代码的可读性和安全性。java.time 包中的类是不可变的,线程安全的。 1. LocalDate, LocalTime, LocalDateTime 这些类分别表示日期、时间和日期时间。