java math.round

The Java Math.round() method is used to round off a decimal value to the nearest integer. The method takes a single argument, which is the decimal value that needs to be rounded off.

Syntax:

public static long round(double value)

Example:

double num = 3.45;
long roundedNum = Math.round(num);
System.out.println(roundedNum); // Output: 3

In the above example, the Math.round() method is used to round off the decimal value 3.45 to the nearest integer, which is 3. The output is then printed to the console.

相关问题

java Math.round

Java中的Math.round()方法是将浮点型进行“四舍五入”转换为int类型的一个方法（不含小数点.0）。它的使用方式是直接调用Math类的round()方法，并传入需要进行四舍五入的浮点数作为参数。该方法会返回一个整数值，表示四舍五入后的结果。例如，Math.round(10.5)的结果是11，Math.round(10.4)的结果是10。需要注意的是，Math.round()方法的四舍五入方式与保留小数位数的四舍五入方式有所不同。\[2\]\[3\]
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java math.round保留小数

在Java中，有几种方法可以用于保留小数点后两位。其中一种常用的方法是使用Math.round函数。通过将要保留小数位数的数值乘以100，然后使用Math.round函数进行四舍五入，再将结果除以100，即可得到保留两位小数的数值。

具体代码如下：

double num = Math.round(5.2544555 * 100) * 0.01;
System.out.println(num);

这段代码会将5.2544555保留两位小数后输出为5.25。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* [java 常用四舍五入保留小数点后两位方法](https://blog.csdn.net/qq_38463737/article/details/121294156)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
- *2* *3* [[Java]保留数值后2位的几种方法](https://blog.csdn.net/u010188178/article/details/98091515)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
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