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(formattedString); } } 在上述代码中,%.2f是一个格式说明符,其中.后的2表示小数点后要显示...
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...
另一种常用的方法是使用Java的String.format方法来格式化数字并将其转换为字符串。 以下是一个示例代码: publicclassStringFormatExample{publicstaticStringformatDecimal(doublenumber,intdecimalPlaces){StringformatString=String.format("%%.%df",decimalPlaces);returnString.format(formatString,number);}publicstaticvoid...
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: doublenum=3.14159;DecimalFormatdf=newDecimalFormat("#.#");Stringresult=df.format (num);// result = "3.1" 复制 使...
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...
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: ...
public class IntegerLiteralBinaryOctalDecimalHex { public static void main(String[] args) { // System.out.println()打印语句打印整数变量或者是整数字面量默认是十进制 // 二进制的整数字面量的使用 byte binary = 0B1101; System.out.println("二进制0B1101转换为十进制的结果是" + binary); ...
I’ll cover three alternatives in this section: StringBuilder’sappend()method, String’sformatted()method and MessageFormat’sformat()method. You could useStringBuilder append()calls as shown below. The code is easier to read, but it is much longer now. Worse, it still doesn’t help much ...
We need to useNumberFormat.format(float)method to format float value to string in predefined format – such as set decimal places in the formatted string. For example, we canformat float to 2 decimal pointsas in the given program. NumberFormatformatter=newDecimalFormat("0.00");Assertions.assertEq...