Question

我正在尝试编译一个java项目。我的代码中出现以下错误。我做错了什么？

import java.lang.reflect.Field;
import java.util.Map;
import java.lang.Object;
import static org.junit.Assert.*;
import static org.junit.Assert.assertThat;
import java.lang.String;
import org.junit.Test;
public class EnvironmentsTest {

@Test
public void testGetFoobar() throws Exception {
    assertNull(System.getenv("MY_VAR"));

    injectEnvironmentVariable("MY_VAR", "my_var");

    assertThat(System.getenv("MY_VAR"), is("my_var"));
}


cannot find symbol
symbol:   method is(java.lang.String)
location: class EnvironmentsTest

Answer 1

是来自Hamcrest的匹配器。见http://hamcrest.org/JavaHamcrest/javadoc/1.3/org/hamcrest/core/Is.html

Answer 2

导入是：

val df =spark.read.jdbc(url = "SomeSQLServerURL",
                table = "(select * from sample.testTable ) a",
                columnName = "x",
                lowerBound = 1,
                upperBound = 10000,
                numPartitions = 100,
                connectionProperties
                )

Answer 3

类型为（），然后按Alt + Enter单击“导入静态方法。”
您可以添加CoreMatchers.is。

like this

方法断言java项目中有复杂错误

3 个答案: