Java 中的 MessageFormat parse()方法,示例:Set–1

原文:https://www . geesforgeks . org/message format-parse-method-in-Java-with-example-set-1/

java.text.MessageFormat 类的 parse() 方法用于从索引的开头解析字符串对象。 语法:

public Object[] parse(String source)
               throws ParseException

参数:该方法将字符串源作为将要进行解析的参数。 返回值:这个方法返回对象数组作为输出。 异常:如果指定字符串的开头无法解析,此方法抛出 ParseException 。 以下是说明解析()方法的示例: 示例 1:

Java 语言(一种计算机语言,尤用于创建网站)

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

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

public class GFG {
    public static void main(String[] argv)
    {
        try {
            // creating and initializing  MessageFormat
            MessageFormat mf
                = new MessageFormat("{0, number, #}, {2, number, #.#}, {1, number, #.##}");
            ;

            // creating and initializing String source
            String str = "10.456, 20.325, 30.444";

            // parsing the string
            // according to MessageFormat
            // using parse() method
            Object[] hash = mf.parse(str);

            // display the result
            System.out.println("Parsed value are :");
            for (int i = 0; i < hash.length; i++)
                System.out.println(hash[i]);
        }
        catch (ParseException e) {
            System.out.println("\nString is Null");
            System.out.println("Exception thrown : " + e);
        }
    }
}

Output: 

Parsed value are :
10.456
30.444
20.325

例 2:

Java 语言(一种计算机语言,尤用于创建网站)

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

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

public class GFG {
    public static void main(String[] argv)
    {
        try {
            // creating and initializing  MessageFormat
            MessageFormat mf
                = new MessageFormat("{0, date}, {2, time}, {1, number}");

            // creating and initializing String source
            String str = "10, 20, 30";

            // parsing the string
            // according to MessageFormat
            // using parse() method
            Object[] hash = mf.parse(str);

            // display the result
            System.out.println("Parsed value are :");
            for (int i = 0; i < hash.length; i++)
                System.out.println(hash[i]);
        }
        catch (ParseException e) {
            System.out.println("String is Null");
            System.out.println("Exception thrown : " + e);
        }
    }
}

Output: 

String is Null
Exception thrown : java.text.ParseException: MessageFormat parse error!

参考:https://docs . Oracle . com/javase/9/docs/API/Java/text/messageformat . html # parse-Java . lang . string-