Javac - 如何将除弃用之外的所有警告视为错误？

Question

我在 javac 中使用

-Werror

标志，将所有警告视为错误（与本文相关：使 javac 将警告视为错误）。

但是，我试图从该规则中排除弃用，以便弃用仍然被视为警告而不是错误。 有没有办法用另一个编译器标志来做到这一点？

Answer 1

添加

-Xlint:-deprecation

javac \
  -Werror \
  -Xlint:all \
  -Xlint:-deprecation \
  Main.java

示例：

Main.java

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class Main {
    public static void main(String[] args) {

        List rawList = new ArrayList(); //warning: [rawtypes] found raw type: ArrayList
        rawList.add("Hello");  // warning: [unchecked] unchecked call to add(E) as a member of the raw type List

        List<String> stringList = (List<String>) rawList;  // warning: [unchecked] unchecked cast

        System.out.println(stringList.get(0)); //Hello

        Date date = new Date();
        int year = date.getYear();    // warning: [deprecation] getYear() in Date has been deprecated
        int month = date.getMonth();  // warning: [deprecation] getMonth() in Date has been deprecated
        int day = date.getDay();      // warning: [deprecation] getDay() in Date has been deprecated
        System.out.println(year + "-"+ month+"-"+day );

    } //main
} //class

测试 1 - 添加

-Werror

使 javac 将警告视为错误

javac \
  -Werror \
  -Xlint:all \
  Main.java

获取

Main.java:8: warning: [rawtypes] found raw type: List
        List rawList = new ArrayList(); //warning: [rawtypes] found raw type: ArrayList
        ^
  missing type arguments for generic class List<E>
  where E is a type-variable:
    E extends Object declared in interface List
Main.java:8: warning: [rawtypes] found raw type: ArrayList
        List rawList = new ArrayList(); //warning: [rawtypes] found raw type: ArrayList
                           ^
  missing type arguments for generic class ArrayList<E>
  where E is a type-variable:
    E extends Object declared in class ArrayList
Main.java:9: warning: [unchecked] unchecked call to add(E) as a member of the raw type List
        rawList.add("Hello");  // warning: [unchecked] unchecked call to add(E) as a member of the raw type List
                   ^
  where E is a type-variable:
    E extends Object declared in interface List
Main.java:11: warning: [unchecked] unchecked cast
        List<String> stringList = (List<String>) rawList;  // warning: [unchecked] unchecked cast
                                                 ^
  required: List<String>
  found:    List
Main.java:16: warning: [deprecation] getYear() in Date has been deprecated
        int year = date.getYear();    // warning: [deprecation] getYear() in Date has been deprecated
                       ^
Main.java:17: warning: [deprecation] getMonth() in Date has been deprecated
        int month = date.getMonth();  // warning: [deprecation] getMonth() in Date has been deprecated
                        ^
Main.java:18: warning: [deprecation] getDay() in Date has been deprecated
        int day = date.getDay();      // warning: [deprecation] getDay() in Date has been deprecated
                      ^
error: warnings found and -Werror specified
1 error
7 warnings

测试 2 - 添加

-Xlint:-deprecation

javac \
  -Werror \
  -Xlint:all \
  -Xlint:-deprecation \
  Main.java

获取

Main.java:8: warning: [rawtypes] found raw type: List
        List rawList = new ArrayList(); //warning: [rawtypes] found raw type: ArrayList
        ^
  missing type arguments for generic class List<E>
  where E is a type-variable:
    E extends Object declared in interface List
Main.java:8: warning: [rawtypes] found raw type: ArrayList
        List rawList = new ArrayList(); //warning: [rawtypes] found raw type: ArrayList
                           ^
  missing type arguments for generic class ArrayList<E>
  where E is a type-variable:
    E extends Object declared in class ArrayList
Main.java:9: warning: [unchecked] unchecked call to add(E) as a member of the raw type List
        rawList.add("Hello");  // warning: [unchecked] unchecked call to add(E) as a member of the raw type List
                   ^
  where E is a type-variable:
    E extends Object declared in interface List
Main.java:11: warning: [unchecked] unchecked cast
        List<String> stringList = (List<String>) rawList;  // warning: [unchecked] unchecked cast
                                                 ^
  required: List<String>
  found:    List
error: warnings found and -Werror specified
Note: Main.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
1 error
4 warnings

• 添加

  -Werror

  • 1 个错误
  • 7 条警告
• 添加

  -Werror

  ，

  -Xlint:-deprecation

  • 1 个错误
  • 4 条警告

警告忽略

deprecation

：

int year = date.getYear();    // warning: [deprecation] getYear() in Date has been deprecated
int month = date.getMonth();  // warning: [deprecation] getMonth() in Date has been deprecated
int day = date.getDay();      // warning: [deprecation] getDay() in Date has been deprecated