Java字符串池与反射相结合可能会在Java中产生一些难以想象的结果:
import java.lang.reflect.Field;
class MessingWithString {
public static void main (String[] args) {
String str = "Mario";
toLuigi(str);
System.out.println(str + " " + "Mario");
}
public static void toLuigi(String original) {
try {
Field stringValue = String.class.getDeclaredField("value");
stringValue.setAccessible(true);
stringValue.set(original, "Luigi".toCharArray());
} catch (Exception ex) {
// Ignore exceptions
}
}
}
上面的代码将输出:
"Luigi Luigi"
Mario发生了什么事?