我昨晚发布了一个有关Java反射的问题a question last night,今天早上发现编译器警告。
C:\javasandbox\reflection>javac ReflectionTest.java
Note: ReflectionTest.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
C:\javasandbox\reflection>javac -Xlint:unchecked ReflectionTest.java
ReflectionTest.java:17: warning: [unchecked] unchecked call to
getDeclaredMethod(java.lang.String,java.lang.Class<?>...) as a member of the raw
type java.lang.Class
myMethod = myTarget.getDeclaredMethod("getValue");
^
ReflectionTest.java:22: warning: [unchecked] unchecked call to
getDeclaredMethod(java.lang.String,java.lang.Class<?>...) as a member of the raw
type java.lang.Class
myMethod = myTarget.getDeclaredMethod("setValue", params);
^
2 warnings
你是否知道检查这些返回方法的"正确"方式?(例如,有没有一种正确的方法来消除这些警告?)
源代码:
import java.lang.reflect.*;
class Target {
String value;
public Target() { this.value = new String("."); }
public void setValue(String value) { this.value = value; }
public String getValue() { return this.value; }
}
class ReflectionTest {
public static void main(String args[]) {
try {
Class myTarget = Class.forName("Target");
Method myMethod;
myMethod = myTarget.getDeclaredMethod("getValue");
System.out.println("Method Name: " + myMethod.toString());
Class params[] = new Class[1];
params[0] = String.class;
myMethod = myTarget.getDeclaredMethod("setValue", params);
System.out.println("Method Name: " + myMethod.toString());
} catch (Exception e) {
System.out.println("ERROR");
}
}
}
Class
会给出“原始类型”错误提示,但对于第二行的Class<?>
则没有问题。 - Soren Stoutner