publicstaticvoidappend(Listlist){list.add(”0042”);}12.publicstaticvoidmain(String[]args){13.ListintList=newArrayList();14.append(intList);15.System.out.println(intList.get(0));16.}Whatistheresult?()A.42B.0042C.Anexceptionisthrownatruntime.D.Compilationfai
题目
A.42
B.0042
C.Anexceptionisthrownatruntime.
D.Compilationfailsbecauseofanerrorinline13.
E.Compilationfailsbecauseofanerrorinline14.
相似考题
更多“publicstaticvoidappend(Listlist){list.add(”0042”);}12.publicstaticvoidmain(String[]args){13.ListintList=newArrayList();14.append(intList);15.System.out.println(intList.get(0));16.}Whatistheresult?() ”相关问题
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第1题：
publicclassTest{privatestaticint[]x;publicstaticvoidmain(String[]args){System.out.println(x[0]);}}Whatistheresult?()A.0
B.null
C.Compilationfails.
D.ANullPointerExceptionisthrownatruntime.
E.AnArrayIndexOutOfBoundsExceptionisthrownatruntime.
参考答案：D
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第2题：
一个java二维数组的问题List list=new ArrayList();
list.add(1);
list.add(2);
list.add(3);
然后赋值成
问题一：如何赋值成底下的形式？
double[][] data = new double[][]{{ 1,2,3 } };
for(int i=0;i<data.length;i++)
{
for(int j=0;j<data[i].length;j++)
{
System.out.println("["+i+"]["+j+"]"+data[i][j]);
}
}
/*输出
[0][0]1.0
[0][1]2.0
[0][2]3.0
*/
问题二：如何创建这样的二维数组？//double[][] data = new double[][]{{ 1,2,3 } };
比如double[][] tt=new double[?][?];
建议这样先试试看：
package com.gxsdxy.test;
public class ArrayInit {
String[][] A = new String[4][4];
public void printString()
{
for(int i=0;i<4;i++)
{
for(int j=0;j<4;j++)
{
A[i][j] = i * 10 + j + "";
System.out.print(A[i][j].toString()+"\t");
}
System.out.println();
}
//return null;
}
public static void main(String[] args) {
ArrayInit array = new ArrayInit();
array.printString();
}
}
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第3题：
5.如下Java代码，输出的运行结果是（） public class Test{ public static void main（String[] args) { List＜String＞ list = new ArrayList＜String＞（); list.add（"str1"); list.add（2, "str2"); String s = list.get（1); System.out.println（s); } }
A．运行时出现异常
B．正确运行，输出str1
C．正确运行，输出str2
D．编译时出现异常
C -
第4题：
publicclassTest{publicstaticvoidmain(String[]args){intx=0;assert(x>0):“assertionfailed”;System.out.println(“finished”);}}Whatistheresult?()A.finished
B.Compilationfails.
C.AnAssertionErroristhrown.
D.AnAssertionErroristhrownandfinishedisoutput.
参考答案：AThisquestionisabittrickybecauseitlacksthefollowinginformation:Itshouldincludeastatementthatsayswhetherornotassertionsareenabled.Iftheyareindeedenabled,the
correctionanswerisC.butiftheyarenot,thecorrectanswerisA.Assertionsarenotenabledbydefaultsoifthequestionisnotchanged,themostlogicalanswerisA. -
第5题：
5. 给定如下Java代码，可以填入横线处的代码是（） public static void main（String[] args) { ________ list.addLast（"001"); }
A．List list = new ArrayList();
B．List list = new List();
C．ArrayList list = new ArrayList();
D．LinkedList list = new LinkedList();
AB