import java.util.function.*;
class Test {
void test(int foo, Consumer<Integer> bar) { }
void test(long foo, Consumer<Long> bar) { }
void test(float foo, Consumer<Float> bar) { }
void test(double foo, Consumer<Double> bar) { }
}
当我用它编译时 javac -Xlint Test.java
我收到几个警告:
Test.java:4: warning: [overloads] test(int,Consumer<Integer>) in Test is potentially ambiguous with test(long,Consumer<Long>) in Test
void test(int foo, Consumer<Integer> bar) { }
^
Test.java:6: warning: [overloads] test(float,Consumer<Float>) in Test is potentially ambiguous with test(double,Consumer<Double>) in Test
void test(float foo, Consumer<Float> bar) { }
^
2 warnings
如果我改变 Consumer
至 Supplier
警告消失了。该程序是免费警告:
import java.util.function.*;
class Test {
void test(int foo, Supplier<Integer> bar) { }
void test(long foo, Supplier<Long> bar) { }
void test(float foo, Supplier<Float> bar) { }
void test(double foo, Supplier<Double> bar) { }
}
这是为什么?这个警告意味着什么?这些方法有何模棱两可?抑制警告是否安全?