public class Demo{ public static void main(String[] args){ List al = new ArrayList(); al.add(“1”); al.add(“2”); al.add(“2”); al.add(“3”); System.out.println(al); } } 上述程序执行后的输出是哪项?()
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public class Demo{ public static void main(String[] args){ List al = new ArrayList(); al.add(“1”); al.add(“2”); al.add(“2”); al.add(“3”); System.out.println(al); } } 上述程序执行后的输出是哪项?()
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class Demo{ public static void main(String[] args){ int x = 0; try{ x = div(1,2); }catch(Exception e){ System.out.println(e); } System.out.println(x) ; } public static int div(int a,int b){ return a / b ; } }
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在Demo类中 public class Demo{ public Demo(){ } } 构造方法Demo重载了
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Given a class Repetition:1.package utils;2.3.public class Repetition{4.public static String twice(Strings){returns+s;}5.}and given another class Demo:1.//insert code here2.3.public class Demo{4.public static void main(String[]args){5.System.out.println(twice("pizza"));6.}7.}Which code should be inserted at line 1 of Demo.java to compile and run Demo to printpizzapizza”?()