Java 我不希望我的函数返回null。最好的解决方案是什么? public T单击子菜单项(菜单栏菜单栏){ int hoveredMenuItemIndex=mouseOverToMenuItemByTitle(menuBar.menuOptionTitle); 如果(hoveredMenuItemIndex>-1) { allSubMenuItem=getWebElements(By.cssSelector(“#topnav>.rootmenu>li:n子项(“+hoveredMenuItemIndex+”)>ul>li>a”); for(WebElement子菜单项:AllSub菜单项){ if(subnumitem.getAttribute(“title”).contains(menuBar.subnumtitle)){ 子菜单项。单击(); 返回InstancePageClass((Class)menuBar.expectedPageClass); } } } 返回null; }
此函数返回一个类,但如果未单击菜单项,则不应返回任何内容并失败。我不想使用null,也不允许使用try-catch块Java 我不希望我的函数返回null。最好的解决方案是什么? public T单击子菜单项(菜单栏菜单栏){ int hoveredMenuItemIndex=mouseOverToMenuItemByTitle(menuBar.menuOptionTitle); 如果(hoveredMenuItemIndex>-1) { allSubMenuItem=getWebElements(By.cssSelector(“#topnav>.rootmenu>li:n子项(“+hoveredMenuItemIndex+”)>ul>li>a”); for(WebElement子菜单项:AllSub菜单项){ if(subnumitem.getAttribute(“title”).contains(menuBar.subnumtitle)){ 子菜单项。单击(); 返回InstancePageClass((Class)menuBar.expectedPageClass); } } } 返回null; },java,selenium-webdriver,automation,Java,Selenium Webdriver,Automation,此函数返回一个类,但如果未单击菜单项,则不应返回任何内容并失败。我不想使用null,也不允许使用try-catch块 在Java 8中,将返回类型更改为,然后返回或 然后调用方可以调用,如果为true,则可以调用以获取实际值。检查javadoc以了解其他有用的方法 public <T extends BasePage> T clickSubMenuItem(MenuBar menuBar) { int hoveredMenuItemIndex =mouseOverTo
在Java 8中,将返回类型更改为,然后返回或 然后调用方可以调用,如果为true,则可以调用以获取实际值。检查javadoc以了解其他有用的方法
public <T extends BasePage> T clickSubMenuItem(MenuBar menuBar) {
int hoveredMenuItemIndex =mouseOverToMenuItemByTitle(menuBar.menuOptionTitle);
if (hoveredMenuItemIndex > -1)
{
allSubMenuItem = getWebElements(By.cssSelector("#topnav > .rootmenu > li:nth-child(" + hoveredMenuItemIndex + ") > ul > li > a"));
for (WebElement subMenuItem : allSubMenuItem) {
if (subMenuItem.getAttribute("title").contains(menuBar.subMenuTitle)) {
subMenuItem.click();
return instantiatePageClass((Class<T>) menuBar.expectedPageClass);
}
}
}
return null;
}
public可选点击子菜单项(菜单栏菜单栏){
int hoveredMenuItemIndex=mouseOverToMenuItemByTitle(menuBar.menuOptionTitle);
如果(hoveredMenuItemIndex>-1){
allSubMenuItem=getWebElements(By.cssSelector(“#topnav>.rootmenu>li:n子项(“+hoveredMenuItemIndex+”)>ul>li>a”);
for(WebElement子菜单项:AllSub菜单项){
if(subnumitem.getAttribute(“title”).contains(menuBar.subnumtitle)){
子菜单项。单击();
返回可选的.of(InstancePageClass((Class)menuBar.expectedPageClass));
}
}
}
返回可选的.empty();
}
在Java 8中,将返回类型更改为,然后返回或
然后调用方可以调用,如果为true,则可以调用以获取实际值。检查javadoc以了解其他有用的方法
public <T extends BasePage> T clickSubMenuItem(MenuBar menuBar) {
int hoveredMenuItemIndex =mouseOverToMenuItemByTitle(menuBar.menuOptionTitle);
if (hoveredMenuItemIndex > -1)
{
allSubMenuItem = getWebElements(By.cssSelector("#topnav > .rootmenu > li:nth-child(" + hoveredMenuItemIndex + ") > ul > li > a"));
for (WebElement subMenuItem : allSubMenuItem) {
if (subMenuItem.getAttribute("title").contains(menuBar.subMenuTitle)) {
subMenuItem.click();
return instantiatePageClass((Class<T>) menuBar.expectedPageClass);
}
}
}
return null;
}
public可选点击子菜单项(菜单栏菜单栏){
int hoveredMenuItemIndex=mouseOverToMenuItemByTitle(menuBar.menuOptionTitle);
如果(hoveredMenuItemIndex>-1){
allSubMenuItem=getWebElements(By.cssSelector(“#topnav>.rootmenu>li:n子项(“+hoveredMenuItemIndex+”)>ul>li>a”);
for(WebElement子菜单项:AllSub菜单项){
if(subnumitem.getAttribute(“title”).contains(menuBar.subnumtitle)){
子菜单项。单击();
返回可选的.of(InstancePageClass((Class)menuBar.expectedPageClass));
}
}
}
返回可选的.empty();
}
返回可选项并对其执行操作
例如:
public <T extends BasePage> Optional<T> clickSubMenuItem(MenuBar menuBar) {
int hoveredMenuItemIndex =mouseOverToMenuItemByTitle(menuBar.menuOptionTitle);
if (hoveredMenuItemIndex > -1) {
allSubMenuItem = getWebElements(By.cssSelector("#topnav > .rootmenu > li:nth-child(" + hoveredMenuItemIndex + ") > ul > li > a"));
for (WebElement subMenuItem : allSubMenuItem) {
if (subMenuItem.getAttribute("title").contains(menuBar.subMenuTitle)) {
subMenuItem.click();
return Optional.of(instantiatePageClass((Class<T>) menuBar.expectedPageClass));
}
}
}
return Optional.empty();
}
可选的myMethod(){
//逻辑
返回可选的.empty();
}
myMethod.map(someClass::someAction).orElse(doWhatEverYouWantWhenNull);
有关可选的详细信息:返回可选并对其执行操作 例如:
public <T extends BasePage> Optional<T> clickSubMenuItem(MenuBar menuBar) {
int hoveredMenuItemIndex =mouseOverToMenuItemByTitle(menuBar.menuOptionTitle);
if (hoveredMenuItemIndex > -1) {
allSubMenuItem = getWebElements(By.cssSelector("#topnav > .rootmenu > li:nth-child(" + hoveredMenuItemIndex + ") > ul > li > a"));
for (WebElement subMenuItem : allSubMenuItem) {
if (subMenuItem.getAttribute("title").contains(menuBar.subMenuTitle)) {
subMenuItem.click();
return Optional.of(instantiatePageClass((Class<T>) menuBar.expectedPageClass));
}
}
}
return Optional.empty();
}
可选的myMethod(){
//逻辑
返回可选的.empty();
}
myMethod.map(someClass::someAction).orElse(doWhatEverYouWantWhenNull);
有关可选项的详细信息:返回空对象抛出一个
ClassNotFoundException
?返回空对象抛出一个ClassNotFoundException
?