of(double)方法有助於我們獲得OptionalDouble對象,該對象包含一個double值,該double值作為參數傳遞給此方法。
用法:
public static OptionalDouble of(double value)
參數:此方法接受一個double值作為參數,該值將設置為返回的OptionalDouble對象。
返回值:此方法返回一個帶有當前值的OptionalDouble。
以下示例程序旨在說明(double)方法:
示例1:
// Java program to demonstrate
// OptionalDouble.of(double) method
import java.util.OptionalDouble;
public class GFG {
public static void main(String[] args)
{
// Create a OptionalDouble instance
// using of() method
OptionalDouble opDouble
= OptionalDouble.of(45213.246);
// Get value of this OptionalDouble instance
System.out.println("OptionalDouble: "
+ opDouble);
}
}
輸出:
OptionalDouble: OptionalDouble[45213.246]
示例2:
// Java program to demonstrate
// OptionalDouble.of(double) method
import java.util.OptionalDouble;
public class GFG {
public static void main(String[] args)
{
// Create a OptionalDouble instance
// using of() method
OptionalDouble opDouble
= OptionalDouble.of(21438999);
// Get value of this OptionalDouble instance
System.out.println("OptionalDouble: "
+ opDouble);
}
}
輸出:
OptionalDouble: OptionalDouble[2.1438999E7]
參考文獻: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalDouble.html#of(double)
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