题目内容
给出以下代码，请问该程序的运行结果是为什么？public class Example {public static void main(String args[]){String s1 = “abc”;String s2 = “abc”;if(s1==s2)System. out. println("1");elseSystem . out . println("2") ;if (s1 . equals (s2))System . out . println("3") ;elseSystem . out . println("4") ;}}请选择所有正确答案：
查看答案
搜索结果不匹配？点我反馈
更多问题
给出以下代码，请问该程序的运行结果是什么？public class Example{public static void main (String args [] ) {String s1 = "abc";String s2 = new String("abc");if (s1 == s2)System . out . println("1");elseSystem . out . println("2");if (s1 . equals (s2))System . out . println("3");elseSystem . out . println("4");}}
给出以下代码,请问该程序的运行结果是什么?class Tree {}class Pinc extends Tree{}class Oak extends Tree{}public class Forest {public static void main (String [] args){Tree tree = new Pinc();if (tree instanceof Pinc)System. out. printin (“Pinc”);if (tree instanceof Tree)System. out. printin (“Tree”);if (tree instanceof Oak);System. out. printin (“Oak”);elseSystem. out. println (“Oops”);}}
给出以下代码,请问以下哪些选项会抛出NullPointerException异常来?String s=null;
给出以下代码,请问哪些表达式运行期异常抛出?int = 0 , j = 1;请选择所有正确答案:
微信支付 
支付宝支付