Question

给定以下类（编辑器是包名称）：

@Target({ ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
public @interface Annot {
      String value();
}

public class JavaTest {
    public static final String TEST_STRING = "test";

    @Annot(TEST_STRING) //works
    private int a;
}

public class GroovyClass {
    public static final String TEST_STRING = 'test';
    public static final String TEST_STRING_MULTILINE = '''test''';
    public static final String TEST_GSTRING = "test";
    public static final String TEST_GSTRING_MULTILINE = """test""";

    @Annot(TEST_GSTRING) //Groovy:Expected 'TEST_GSTRING' to be an inline constant of type java.lang.String not a field expression in @editor.Annot
    private int a;

    @Annot(TEST_STRING_MULTILINE) //Groovy:Expected 'TEST_STRING_MULTILINE' to be an inline constant of type java.lang.String not a field expression in @editor.Annot
    private int b;

    @Annot(TEST_GSTRING) //Groovy:Expected 'TEST_GSTRING' to be an inline constant of type java.lang.String not a field expression in @editor.Annot
    private int c;

    @Annot(TEST_GSTRING_MULTILINE) //Groovy:Expected 'TEST_GSTRING_MULTILINE' to be an inline constant of type java.lang.String not a field expression in @editor.Annot
    private int d;
}

JavaClass按预期工作，但GroovyClass给出了这些编译器错误（在代码中注释）。不确定是什么问题..如何在groovy中为字符串值赋值？

Answer 1

你必须通过classname

访问它

import java.lang.annotation.*

@Target([ElementType.FIELD])
@Retention(RetentionPolicy.RUNTIME)
@interface Annot {
String value();
}

class GroovyClass {

    static final TEST_STRING = 'test'
    @Annot(GroovyClass.TEST_STRING) private int a;

    // FAILS static final TEST_GSTRING = "test$TEST_STRING"
    // FAILS @Annot(GroovyClass.TEST_GSTRING) private int b;

}

assert GroovyClass.getDeclaredField('a').annotations.first().value()==GroovyClass.TEST_STRING
// FAILS assert GroovyClass.getDeclaredField('b').annotations.first().value()==GroovyClass.TEST_GSTRING

Groovy 2.3

Groovy常量String作为注释值

1 个答案: