【Java基础】10. 格式化输出 System.out.printf(format,items);,format is a string consists of substrings and format specifiers. A format specifier specifies how an item should be displayed. An item may be a numeric valu
System.out.format("%f%n", pi); // --> "3.141593" System.out.format("%.3f%n", pi); // --> "3.142" System.out.format("%10.3f%n", pi); // --> " 3.142" System.out.format("%-10.3f%n", pi); // --> "3.142" System.out.format(Locale.FRANCE, "%-10.4f%n%n", pi)...
jshell> System.out.printf("%s %S!%n","Hello","World"); Hello WORLD! Boolean formatting examples are given below: jshell> System.out.printf("%b%n", false); false jshell> System.out.printf("%b%n", 0.5); true jshell> System.out.printf("%b%n", "false"); true Time Formatting ‘...
The first argument of the printf() method, theformat string, specifies the format of the text to print along with any number of placeholders for printing numeric values. The placeholders are known as format specifiers. Aformat specifierspecifies the type of value to print in its place. A form...
Java String format specifiers Next we use two basic format specifiers. Main.java void main() { System.out.format("There are %d %s.%n", 5, "pencils"); System.out.printf("The rock weighs %f kilograms.%n", 5.345); } In this program, we format two simple sentences. ...
System.out.printf("%4s - %4s %n", df1.format(val), df2.format(val)); } } The program prints four double values using two format specifiers. $ java Main.java 0,31 - ,31 5,6 - 5,60 6,7 - 6,70 5 - 5,00 The applyPattern method ...
String s = String.format("%s were %d %s", "There", 3, " people"); System.out.println(s); The output to the above would be: There were 3 people Notice how we need to simply provide as many parameters as many format specifiers are there. So as to simply fill in the blanks. ...
Log messages can use any ofJava's printf format specifiers; such as%s,%d,%016xetc. Note that you may also see code and documentation that references theGoogleLoggerclass. This is a minor variant of the defaultFluentLoggerdesigned for use in Google's codebase. TheFluentLoggerAPI is recommende...
Printf-style format strings should be used correctly 代码片段: logger.info("SXSSF Page Thread 导出数据,花费:" + second + "s/ " + millisEnd + "ms"); 红色警告: SonarLint: Use the built-in formatting to construct this argument. SonarLint: Format specifiers should be used instead of string ...
本文介绍了Java的BigDecimal如何通过将小数扩大N倍并保留精度信息来实现高精度运算,避免了浮点数因二进制存储导致的精度丢失问题。推荐使用字符串构造BigDecimal以避免浮点误差,并解释了BigDecimal的比较方法。