public class FormatFloatExample { public static void main(String[] args) { double number = 123.456789; int decimalPlaces = 2; String formattedString = String.format("%.2f", number); System.out.println(formatted
public class FormatDecimalExample { public static void main(String[] args) { double number = 123.456789; System.out.printf("Formatted to two decimal places: %.2f%n", number); } } 运行结果: Formatted to two decimal places: 123.46 说明: %.2f 表示格式化为浮点数并保留两位小数。 方法2:使用 ...
String.format()方法可以根据指定的格式化字符串,对数字进行格式化。下面是使用String.format()方法的示例代码: publicclassMain{publicstaticvoidmain(String[]args){doublenumber=123.456789;StringformattedNumber=String.format("%.3f",number);System.out.println("Formatted number with 3 decimal places: "+formatted...
publicclassDecimalPlaces{publicstaticvoidmain(String[]args){// 步骤1:定义一个原始小数doubleoriginalNumber=3.14;// 步骤2:确定需要增加的小数位数intdecimalPlaces=5;// 步骤3:使用字符串格式化方法增加小数位数StringformattedNumber=String.format("%."+decimalPlaces+"f",originalNumber);// 步骤4:将格式化后...
We create a new instance of theDecimalFormat. We pass it a non-localized pattern string. The pattern defines a format for a decimal value with a dot followed by two decimal places. df.applyPattern("#.00"); We specify a new pattern withapplyPattern. This pattern adds zeros to decimal place...
使用String.format () 方法,它可以按照指定的格式化字符串来输出数值,比如 “%.1f” 表示保留一位小数。例如: doublenum=3.14159;Stringresult=String.format ("%.1f", num);// result = "3.1" 复制 使用DecimalFormat 类,它可以按照指定的模式来格式化数值,比如 “#.#” 表示保留一位小数。例如: ...
System.out.println(decimal.toString());//输出:9E-14System.out.println(decimal.toPlainString());//输出: 0.00000000000009System.out.println(decimalFormatNumberOfDecimalPlaces2.format(decimal));//输出:0.00Map<String, Object> map =newjava.util.HashMap<>(); ...
System.out.println(df.format(PI)); DecimalFormatallows us to explicitly set rounding behavior, giving more control of the output than theString.format()used above. 4. RoundingDoubles WithBigDecimal To rounddoubles tondecimal places, we can write ahelper method: ...
Precision formatting upto 2 decimal places 3.15 As you can see it rounds off to the next decimal in the second case. Width Specifier, Aligning, Fill With Zeros In this section, we’ll see three examples for each of these: jshell> System.out.printf("'%5.2f'%n", 2.28); ...
public static void main(String[] args) { NumberFormat formatter = new DecimalFormat( "000000"); String s = formatter.format(-1234.567); // -001235 System.out.println(s); formatter = new DecimalFormat( "##"); s = formatter.format(-1234.567); // -1235 System.out.println(s); s = form...