Tutoriel d'apprentissage sur la méthode void en programmation Java

public class TestVoidMethod {
 
  public static void main(String[] args) {
   printGrade(78.5);
  }
 
  public static void printGrade(double score) {
   if (score >= 90.0) {
     System.out.println('A');
   }
   else if (score >= 80.0) {
     System.out.println('B');
   }
   else if (score >= 70.0) {
     System.out.println('C');
   }
   else if (score >= 60.0) {
     System.out.println('D');
   }
   else {
     System.out.println('F');
   }
  }
}

C

@Override
  public void updateRuleName(Long ruleId, String newRuleName, Long ucId) {
    Assert.notNull(ruleId, "规则ID不能为Null");
    Assert.notNull(newRuleName, "规则名称不能为Null");
    Assert.notNull(ucId, "操作人的UCID不能为Null");
     
    String cleanNewRuleName = StringUtils.trim(newRuleName);
    if (StringUtils.isBlank(cleanNewRuleName)) {
      throw new IllegalArgumentException("新的规则名称不能为空");
    }
     
    // 查询规则对象
    Rule rule = queryRuleById(ruleId);
    if (null == rule) {
      throw new IllegalDataException("没有查到该规则");
    }
     
    rule.setRuleId(ruleId);
    rule.setRuleName(cleanNewRuleName);
    rule.setUpdateUcid(ucId);
    rule.setUpdateTime(new Date());
     
    ruleDao.updateSelective(rule);
  }

@Test
  public void testUpdateRuleName() {
    Long ruleId = 1L;
    String newRuleName = "newRuleName";
    Long ucId = 123L;
     
    List<Rule> rules = new ArrayList<Rule>();
    Rule rule = new Rule();
    rule.setRuleStatus((byte) DBValueSetting.RULE_STATUS_TAKE_EFFECT);
    rules.add(rule);
     
    // 查询规则对象
    Map<String, Object> params = new HashMap<String, Object>();
    params.put("ruleId", ruleId);
    Mockito.when(ruleDao.queryRulesByCondition(params)).thenReturn(rules);
     
    Mockito.doAnswer(new Answer<Object>() {
      public Object answer(InvocationOnMock invocation) {
        // 断点2：这里随后执行
        Rule rule = (Rule) invocation.getArguments()[0];
        Assert.assertTrue(rule.getRuleName().equals("newRuleName"));
        return null;
      }
    }).when(ruleDao).updateSelective(Mockito.any(Rule.class));
     
    // 断点1：先执行到这里
    ruleService.updateRuleName(ruleId, newRuleName, ucId);
  }

public interface Answer<T> {
  /**
   * @param invocation the invocation on the mock.
   *
   * @return the value to be returned
   *
   * @throws Throwable the throwable to be thrown
   */
  T answer(InvocationOnMock invocation) throws Throwable;
}