Java SQL Timestamp setNanos()函数及示例

setNanos()函数是Java SQL 的Timestamp 类的一部分。该函数用于设置Timestamp 对象秒值的小数部分。该函数将对象的 Nanos 值设置为给定值。
函数签名：

public void setNanos(int t)

句法：

ts1.setNanos(l);

参数：该函数接受 int 值t作为参数，这是要设置的纳秒值。
返回值：函数不返回任何值。
异常：如果传递的参数小于0或大于999999999，函数抛出IllegalArgumentException
下面的例子说明了 setNanos()函数的使用
示例 1：创建时间戳并使用 setNanos() 设置时间戳对象的小数部分。

Java

// Java program to demonstrate the
// use of setNanos() function
 
import java.sql.*;
 
public class solution {
    public static void main(String args[])
    {
 
        try {
 
            // Create two timestamp objects
            Timestamp ts = new Timestamp(10000);
 
            // Display the timestamp object
            System.out.println("Timestamp time : "
                               + ts.toString());
 
            // Set the value of the fractional part
            // of timestamp object
            // using setNanos function
            ts.setNanos(1000000);
 
            // Display the new timestamp object
            System.out.println("New Timestamp time : "
                               + ts.toString());
        }
 
        catch (IllegalArgumentException e) {
 
            // Display the error if any error has occured
            System.err.println(e.getMessage());
        }
    }
}

输出：

Timestamp time : 1970-01-01 00:00:10.0
New Timestamp time : 1970-01-01 00:00:10.001

示例 2：创建时间戳并使用 setNanos() 设置时间戳对象的小数部分，并将负 int 值作为参数传递。

Java

// Java program to demonstrate the
// use of setNanos() function
 
import java.sql.*;
 
public class solution {
    public static void main(String args[])
    {
 
        try {
 
            // Create two timestamp objects
            Timestamp ts = new Timestamp(10000);
 
            // Display the timestamp object
            System.out.println("Timestamp time : "
                               + ts.toString());
 
            // Set the value of the fractional part
            // of timestamp object
            // using setNanos function
            ts.setNanos(-1000000);
 
            // Display the new timestamp object
            System.out.println("New Timestamp time : "
                               + ts.toString());
        }
 
        catch (IllegalArgumentException e) {
 
            // Display the error if any error has occured
            System.out.println(e.getMessage());
        }
    }
}

输出：

Timestamp time : 1970-01-01 00:00:10.0
nanos > 999999999 or < 0

参考： https: Java/sql/Timestamp.html