Java 中的 MessageFormat format format to character()方法，示例
原文:https://www . geeksforgeeks . org/messageformat-formattocharacteriator-method-in-Java-with-example/
java.text.MessageFormat 类的format to character()方法用于格式化对象数组，并将它们插入消息格式对象的模式中。
语法:
public AttributedCharacterIterator formatToCharacterIterator(Object arguments)
参数:该方法将对象数组作为参数进行格式化。
返回值:这个方法返回属性字符迭代器，它将描述格式化的值。
异常:如果参数为空，该方法抛出空指针异常。
以下是举例说明格式特征描述符()方法的例子:
例 1:
// Java program to demonstrate
// formatToCharacterIterator() method
import java.text.*;
import java.util.*;
import java.io.*;
public class GFG {
public static void main(String[] argv)
{
try {
// creating and initializing new MessageFormat Object
MessageFormat mf
= new MessageFormat("{0, number, #}, {0, number, #.##}, {0, number}");
// Creating and initializing an array of type Double
// to be formated
Object[] objs = { new Double(4.234567) };
// Formating an array of object
// using formatToCharacterIterator() method
CharacterIterator str = mf.formatToCharacterIterator(objs);
// display the result
System.out.print("formatted array : ");
System.out.print(str.first());
for (int i = 0; i <= str.getEndIndex() - 2; i++)
System.out.print(str.next());
}
catch (NullPointerException e) {
System.out.println("pattern is null ");
System.out.println("Exception thrown : " + e);
}
}
}
输出:
formatted array : 4, 4.23, 4.235
例 2:
// Java program to demonstrate
// formatToCharacterIterator() method
import java.text.*;
import java.util.*;
import java.io.*;
public class GFG {
public static void main(String[] argv)
{
try {
// creating and initializing new MessageFormat Object
MessageFormat mf
= new MessageFormat("{0, number, #}, {0, number, #.##}, {0, number}");
// Creating and initializing an array of type Double
// to be formated
Object[] objs = { new Double(4.234567) };
// Formating an array of object
// using formatToCharacterIterator() method
CharacterIterator str = mf.formatToCharacterIterator(null);
// display the result
System.out.print("formatted array : ");
System.out.print(str.first());
for (int i = 0; i <= str.getEndIndex() - 2; i++)
System.out.print(str.next());
}
catch (NullPointerException e) {
System.out.println("argument is null ");
System.out.println("Exception thrown : " + e);
}
}
}
输出:
argument is null
Exception thrown : java.lang.NullPointerException: formatToCharacterIterator must be passed non-null object
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