Java标准注释 [英] Java Standard Annotations
问题描述
可以任何人都告诉我放在哪里,以便方法已被弃用
警告不会再来了?
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 a armstrong number);
}
else
{
System.out.println(It does not a armstrong number);
}
}
public static void main(String [] args)
{
try
{
Ch10LU2Ex4 obj = new Ch10LU2Ex4();
obj.invokeDeprecatedMethod();
方法方法= obj.getClass()。getMethod(armStrong,Integer.TYPE);
注释[] annos = method.getAnnotations(); (int i = 0; i< annos.length; i ++)
{
System.out.println(annos [i]);
}
}
catch(异常e)
{
e.printStackTrace();
}
}
@SuppressWarnings(deprecation)
public void invokeDeprecatedMethod()
{
try
{
系统.out.println(输入介于100和999之间的数字:);
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int x = Integer.parseInt(br.readLine());
Ch10LU2Ex4.armStrong(x);
}
catch(IOException e)
{
e.printStackTrace();
}
}
}
这是功能而不是错误。您不需要一个 @SuppressWarnings
来调用该类本身中类的已弃用方法,因为这样的调用不首先产生废弃警告。来自其他类的已弃用方法的调用将需要 @SuppressWarnings
注释。
I have recently started reading into annotations. I deprecated the armStrong() method here and I need to suppress the deprecation warning but wherever I put it it says "unnecessary @SuppressWarnings("deprecation")".
Can anyone tell me where to place it so that the method is deprecated
warning would not come anymore?
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();
}
}
}
This is a feature, not a bug. 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. Calls to the deprecated method from other classes will need the @SuppressWarnings
annotation.
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