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...
可以使用String类的length方法计算字符串的长度,并结合小数点的索引位置进行计算。 intdecimalPlaces=input.length()-dotIndex-1; 1. 这里的decimalPlaces变量将存储小数点后的位数。 4. 补0操作 根据小数点后的位数,我们可以确定需要补0的个数。可以使用Java的String类的format方法来实现补0操作。 Stringformatted=S...
double pi = 3.141592653589793; String formattedPi = String.format("Pi rounded to 2 decimal places: %.2f", pi); System.out.println(formattedPi); // 输出: Pi rounded to 2 decimal places: 3.14 5. 指出使用String format方法和占位符时需要注意的事项 在使用String.format方法和占位符时,需要注意...
String.format() format string accepts argument type specifiers (eg. %d for numbers, %s for strings). Example: String.format("This is year %d!") String.format() generally gives you much more control over how the argument is displayed thanks to many options you can specify with the type spe...
1. For Strings, specifies the maximum number of characters from the String to print. 2. For floating point numbers, specifies the number of decimal places to display ( the default is 6), rounding if there are too many of adding trailing zeros if there are too few. ...
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<>(); ...
public class Decimal { public static void main(String[] args) { double num = 1.34567; System.out.format("%.4f", num); } } Output 1.3457 In the above program, we've used the format() method to print the given floating-point number num to 4 decimal places. The 4 decimal places are...
double d = 36.98d; String s = String.format("%f", d); System.out.println(s); //36.980000 DecimalFormat We can use DecimalFormat class to convert double to String. We can also get string representation with specified decimal places and rounding of half-up. double d = 123.454d; String ...
HALF_UP).doubleValue(); } } import java.text.*; public class Numbers { public static double TwoDecimalPlaces(double number) { return Double.parseDouble(String.format("%.2f", number)); } } 后记 原来不需要使用double来强制转换,因为Math.round()返回值是double类型的。