java.lang.Package類的getAnnotations()方法用於獲取此類中存在的注釋。該方法返回存在的注釋數組。
用法:
public Annotation[] getAnnotations()
參數:此方法不接受任何參數。
返回值:此方法返回存在的注釋數組。
下麵的程序演示了getAnnotations()方法。
範例1:
// Java program to demonstrate
// getAnnotations() method
import java.util.*;
import java.lang.annotation.*;
@Deprecated
public class Test {
public Object obj;
public static void main(String[] args)
throws ClassNotFoundException
{
try {
// returns the Class object for this class
Class myClass = Test.class;
System.out.println(
"Class represented by myClass:"
+ myClass.toString());
// Get the annotation
// using getAnnotations() method
System.out.println(
"Annotation of myClass:"
+ Arrays.toString(
myClass.getAnnotations()));
}
catch (Exception e) {
System.out.println(e);
}
}
}
輸出:
Class represented by myClass:class Test Annotation of myClass:[@java.lang.Deprecated()]
範例2:
// Java program to demonstrate
// getAnnotations() method
import java.util.*;
import java.lang.annotation.*;
// create a custom Annotation
@Retention(RetentionPolicy.RUNTIME)
@interface Annotation {
// This annotation has two attributes.
public String key();
public String value();
}
// call Annotation for method
// and pass values for annotation
@Annotation(key = "GFG", value = "GeeksForGeeks")
public class Test {
public Object obj;
public static void main(String[] args)
throws ClassNotFoundException
{
// returns the Class object for this class
Class myClass = Test.class;
System.out.println(
"Class represented by myClass:"
+ myClass.toString());
// Get the annotation
// using getAnnotations() method
System.out.println(
"Annotation of myClass:"
+ Arrays.toString(
myClass.getAnnotations()));
}
}
輸出:
Class represented by myClass:class Test Annotation of myClass:[@Annotation(key=GFG, value=GeeksForGeeks)]
參考: https://docs.oracle.com/javase/9/docs/api/java/lang/Package.html#getAnnotations-
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注:本文由純淨天空篩選整理自guptayashgupta53大神的英文原創作品 Package getAnnotations() method in Java with Examples。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。