[英]Java Standard Annotations
I have recently started reading into annotations. 我最近开始阅读注释。 I deprecated the armStrong() method here and I need to suppress the deprecation warning but wherever I put it it says "unnecessary @SuppressWarnings("deprecation")".
我在这里弃用了armStrong()方法,我需要取消弃用警告,但是无论放到哪里,它都说“不必要的@SuppressWarnings(“弃用”)“。
Can anyone tell me where to place it so that the method is deprecated
warning would not come anymore? 谁能告诉我将其放置在何处,以便
method is deprecated
该method is deprecated
警告将不再出现?
import java.io.*;
import java.lang.annotation.*;
import java.lang.reflect.Method;
@Retention(RetentionPolicy.RUNTIME)
@interface number
{
String arm();
}
public class Ch10LU2Ex4
{
@Deprecated
@number(arm = "Armstrong number")
public static void armStrong(int n)
{
int temp, x, sum = 0;
temp = n;
while(temp!=0)
{
x = temp%10;
sum = sum+x*x*x;
temp = temp/10;
}
if(sum==n)
{
System.out.println("It is an armstrong number");
}
else
{
System.out.println("It is not an armstrong number");
}
}
public static void main(String[] args)
{
try
{
Ch10LU2Ex4 obj = new Ch10LU2Ex4();
obj.invokeDeprecatedMethod();
Method method = obj.getClass().getMethod("armStrong", Integer.TYPE);
Annotation[] annos = method.getAnnotations();
for(int i = 0; i<annos.length; i++)
{
System.out.println(annos[i]);
}
}
catch(Exception e)
{
e.printStackTrace();
}
}
@SuppressWarnings("deprecation")
public void invokeDeprecatedMethod()
{
try
{
System.out.println("Enter a number between 100 and 999:");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int x = Integer.parseInt(br.readLine());
Ch10LU2Ex4.armStrong(x);
}
catch(IOException e)
{
e.printStackTrace();
}
}
}
Using a deprecated method from another method is what causes a warning. 使用 另一方法已过时的方法是什么原因导致的警告。
A typical use will look like this: 典型用法如下所示:
@SuppressWarnings("deprecation")
public void invokeDeprecatedMethod() {
instanceofotherclass.armStrong(1);
}
Within the same class, it is assumed that the programmer knows what he's doing. 在同一个类中,假定程序员知道他在做什么。
This is a feature, not a bug . 这是一个功能,而不是错误 。 You don't need a
@SuppressWarnings
for a call to a deprecated method of a class from within that class itself , because such calls don't generate a deprecation warning in the first place. 您不需要
@SuppressWarnings
来从该类本身内部调用该类的不赞成使用的方法,因为此类调用首先不会产生不赞成使用的警告。 Calls to the deprecated method from other classes will need the @SuppressWarnings
annotation. 从其他类调用不推荐使用的方法将需要
@SuppressWarnings
批注。
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