Java 中的 FieldPosition getField()方法，示例

原文:https://www . geesforgeks . org/field position-getfield-method-in-Java-with-example/

java.text.FieldPosition 类的 getField() 方法用于检索该字段位置对象的字段标识符。 语法:

public int getField()

参数:该方法不接受任何参数作为参数。 返回值:该方法返回该字段位置对象的字段标识。 以下是举例说明 getField() 方法: 例 1:

Java 语言(一种计算机语言，尤用于创建网站)

// Java program to demonstrate
// getField() method

import java.text.*;
import java.util.*;
import java.io.*;

public class GFG {
    public static void main(String[] argv)
    {
        try {

            // Creating and initializing
            // new FieldPosition Object
            FieldPosition pos
                = new FieldPosition(
                    MessageFormat.Field.ARGUMENT);

            // getting Field attribute
            // of FieldPosition object
            // using getField() method
            int i = pos.getField();

            // display result
            System.out.println(
                "field attribute :- "
                + Integer.toString(i));
        }

        catch (ClassCastException e) {

            System.out.println("Exception thrown : " + e);
        }
    }
}

Output: 

field attribute :- -1

例 2:

Java 语言(一种计算机语言，尤用于创建网站)

// Java program to demonstrate
// getField() method

import java.text.*;
import java.util.*;
import java.io.*;

public class GFG {
    public static void main(String[] argv)
    {
        try {

            // Creating and initializing
            // new FieldPosition Object
            FieldPosition pos
                = new FieldPosition(
                    DateFormat.Field.AM_PM);

            // getting Field attribute
            // of FieldPosition object
            // using getField() method
            int i = pos.getField();

            // display result
            System.out.println(
                "field attribute :- "
                + Integer.toString(i));
        }

        catch (ClassCastException e) {

            System.out.println("Exception thrown : " + e);
        }
    }
}

Output: 

field attribute :- -1

参考:T2【https://docs . Oracle . com/javase/9/docs/API/Java/text/field position . html # getField–T4】

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