用示例选择 Java 中的 Format parse()方法
原文:https://www . geesforgeks . org/choice format-parse-method-in-Java-with-examples/
Java . text . ChoiceFormat类的 parse() 方法用于获取 choice format 对象中特定格式的限制值。
语法:
public Number parse(String text, ParsePosition status)
参数:该方法取以下参数:
- Text: is the text whose limit value must be found in string format.
- Status: is the index where this option exists, and the limit value of this index can be found.
返回值:这个方法返回一个指定类型的数组，它是附加到 ChoiceFormat 对象的格式。
异常:如果字符串文本或状态为空，该方法抛出 空指针异常 。
以下是说明解析()方法的示例:
例 1:
// Java program to demonstrate
// getFormats() method
import java.text.*;
import java.util.*;
import java.io.*;
public class GFG {
public static void main(String[] argv)
{
try {
// creating and initializing ChoiceFormat
ChoiceFormat cf1
= new ChoiceFormat(
"4#wed| 5#thu | 6#fri | 7#sat");
// creating and initializing ParsePosition
ParsePosition par = new ParsePosition(0);
// getting limit of particular format
// of ChoiceFormat Object
// using getFormats() method
Number limit
= cf1.parse("wed", par);
// display the result
System.out.print("limit: "
+ limit.intValue());
}
catch (NullPointerException e) {
System.out.println("\nString is Null");
System.out.println("Exception thrown: " + e);
}
}
}
输出:
limit: 4
例 2:
// Java program to demonstrate
// getFormats() method
import java.text.*;
import java.util.*;
import java.io.*;
public class GFG {
public static void main(String[] argv)
{
try {
// creating and initializing ChoiceFormat
ChoiceFormat cf1
= new ChoiceFormat(
"4#wed| 5#thu | 6#fri | 7#sat");
// creating and initializing ParsePosition
ParsePosition par = new ParsePosition(0);
// getting limit of particular format
// of ChoiceFormat Object
// using getFormats() method
Number limit
= cf1.parse(null, par);
// display the result
System.out.print("limit: "
+ limit.intValue());
}
catch (NullPointerException e) {
System.out.println("String is Null");
System.out.println("Exception thrown: " + e);
}
}
}
输出:
String is Null
Exception thrown: java.lang.NullPointerException
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