public class UnmodifiableArrayList {
// 消除安全漏洞
private static final String[] PRIVATE_VALUES = { "RED", "GREEN" };
public static final List<String> PVALUES = Collections.unmodifiableList(Arrays.asList(PRIVATE_VALUES));
public static void main(String[] args) {
UnmodifiableArrayList UF = new UnmodifiableArrayList();
UF.PVALUES.add(1, "YELLO"); //會拋出UnsupportedOperationException異常
System.out.println(UF);
}
//使用Guava
@Override
public String toString() {
return Objects.toStringHelper(this)
.add("PVALUES0", UnmodifiableArrayList.PVALUES.get(0))
.add("PVALUES1", UnmodifiableArrayList.PVALUES.get(1))
.toString();
}
}