将用户名“tom”改为“jerry”的命令写法正确的是( ) A: usermod<br/>tom -l jerry B: usermod<br/>jerry -l tom C: use rmod<br/>-l tom jerry D: usermod<br/>-l jerry tom

阅读下面的代码：publicclassExample{publicstaticvoidmain(String&#91;&#93;args){String&#91;&#93;strs={"Tom","Jerry","Donald"};//foreach循环遍历数组for(Stringstr:strs){str="Tuffy";}System.out.println(strs&#91;0&#93;+","+strs&#91;1&#93;+","+strs&#91;2&#93;);}}程序的运行结果是（） A: Tom,Jerry B: Tom,Jerry,Tuffy C: Tom,Jerry,Donald D: 以上都不对

t='Mike and Tom't.replace('Mike','Jerry')

Tom and Jerry _______ good friends. A: are B: am C: is D: has

Tom and Jerry can never work together because they _____ (抵触) each other all the time.

代理类型MyDelegate定义如下 则执行下列语句，执行的结果如何？（） d1-=d2；d1（）； A: 调用Tom，Jerry，Mike，Mickey的BeginWork B: 调用Mike，Mickey的BeginWork C: 调用Mickey的BeginWork D: 调用Tom，Jerry的BeginWork

阅读下面的程序public class Example{ public static void main(String&#91;&#93; args) { String&#91;&#93; strs = { "Tom", "Jerry", "Donald" }; // foreach循环遍历数组 for (String str : strs) { str = "Tuffy"; } System.out.println(strs&#91;0&#93; + "," + strs&#91;1&#93; + "," + strs&#91;2&#93;); }}程序的运行结果是（ ） A: Tom,Jerry,Donald B: Tuffy,Jerry,Donald C: Tuffy, Tuffy, Tuffy D: 发生异常，输出异常信息

Tom and Jerry can never work together because they _____ (抵触) each other all the time. A: contradict B: aid C: assist D: cooperate

阅读下面的程序public class Example{public static void main(String&#91;&#93; args) {String&#91;&#93; strs = { "Tom", "Jerry", "Donald" };// foreach循环遍历数组for (String str : strs) {str = "Tuffy";}System.out.println(strs&#91;0&#93; + "," + strs&#91;1&#93; + "," + strs&#91;2&#93;);}}下列选项中,程序的运行结果是( ) A: Tom,Jerry,Donald B: Tuffy,Jerry,Donald C: Tuffy,Tuffy,Tuffy D: 发生异常,输出异常信息

阅读下面的程序public class Example{ public static void main(String&#91;&#93; args) { String&#91;&#93; strs = { "Tom", "Jerry", "Donald" }; // foreach循环遍历数组 for (String str : strs) { str = "Tuffy"; } System.out.println(strs&#91;0&#93; + "," + strs&#91;1&#93; + "," + strs&#91;2&#93;); }}下列选项中,程序的运行结果是( ) A: A、Tom,Jerry,Donald B: B、Tuffy,Jerry,Donald C: C、Tuffy,Tuffy,Tuffy D: D、发生异常,输出异常信息