1．现在输入n个数字，以逗号，分开；然后可选择升或者降序排序；按提交键就在另一页面显示按什么排序，结果为，提供reset
import java.util.*;
public class bycomma{
public static String[] splitStringByComma(String source){
if(source==null||source.trim().equals(""))
return null;
StringTokenizer commaToker = new StringTokenizer(source,",");
String[] result = new String[commaToker.countTokens()];
int i=0;
while(commaToker.hasMoreTokens()){
result = commaToker.nextToken();
i++;
}
return result;
}
public static void main(String args[]){
String[] s = splitStringByComma("5,8,7,4,3,9,1");
int[] ii = new int[s.length];
for(int i = 0;i<s.length;i++){
ii =Integer.parseInt(s);
}
Arrays.sort(ii);
//asc
for(int i=0;i<s.length;i++){
System.out.println(ii);
}
//desc
for(int i=(s.length-1);i>=0;i--){
System.out.println(ii);
}
}
}
2．金额转换，阿拉伯数字的金额转换成中国传统的形式如：（￥1011）－>（一千零一拾一元整）输出。
package test.format;
import java.text.NumberFormat;
import java.util.HashMap;
public class SimpleMoneyFormat {
public static final String EMPTY = "";
public static final String ZERO = "零";
public static final String ONE = "壹";
public static final String TWO = "贰";
public static final String THREE = "叁";
public static final String FOUR = "肆";
public static final String FIVE = "伍";
public static final String SIX = "陆";
public static final String SEVEN = "柒";
public static final String EIGHT = "捌";
public static final String NINE = "玖";
public static final String TEN = "拾";
public static final String HUNDRED = "佰";
public static final String THOUSAND = "仟";
public static final String TEN_THOUSAND = "万";
public static final String HUNDRED_MILLION = "亿";
public static final String YUAN = "元";
public static final String JIAO = "角";
public static final String FEN = "分";
public static final String DOT = ".";
private static SimpleMoneyFormat formatter = null;
private HashMap chineseNumberMap = new HashMap();
private HashMap chineseMoneyPattern = new HashMap();
private NumberFormat numberFormat = NumberFormat.getInstance();
private SimpleMoneyFormat() {
numberFormat.setMaximumFractionDigits(4);
numberFormat.setMinimumFractionDigits(2);
numberFormat.setGroupingUsed(false);
chineseNumberMap.put("0", ZERO);
chineseNumberMap.put("1", ONE);
chineseNumberMap.put("2", TWO);
chineseNumberMap.put("3", THREE);
chineseNumberMap.put("4", FOUR);
chineseNumberMap.put("5", FIVE);
chineseNumberMap.put("6", SIX);
chineseNumberMap.put("7", SEVEN);
chineseNumberMap.put("8", EIGHT);
chineseNumberMap.put("9", NINE);
chineseNumberMap.put(DOT, DOT);
chineseMoneyPattern.put("1", TEN);
chineseMoneyPattern.put("2", HUNDRED);
chineseMoneyPattern.put("3", THOUSAND);
chineseMoneyPattern.put("4", TEN_THOUSAND);
chineseMoneyPattern.put("5", TEN);
chineseMoneyPattern.put("6", HUNDRED);
chineseMoneyPattern.put("7", THOUSAND);
chineseMoneyPattern.put("8", HUNDRED_MILLION);
}
public static SimpleMoneyFormat getInstance() {
if (formatter == null)
formatter = new SimpleMoneyFormat();
return formatter;
}
public String format(String moneyStr) {
checkPrecision(moneyStr);
String result;
result = convertToChineseNumber(moneyStr);
result = addUnitsToChineseMoneyString(result);
return result;
}
public String format(double moneyDouble) {
return format(numberFormat.format(moneyDouble));
}
public String format(int moneyInt) {
return format(numberFormat.format(moneyInt));
}
public String format(long moneyLong) {
return format(numberFormat.format(moneyLong));
}
public String format(Number moneyNum) {
return format(numberFormat.format(moneyNum));
}
private String convertToChineseNumber(String moneyStr) {
String result;
StringBuffer cMoneyStringBuffer = new StringBuffer();
for (int i = 0; i < moneyStr.length(); i++) {
cMoneyStringBuffer.append(chineseNumberMap.get(moneyStr.substring(i, i + 1)));
}
//拾佰仟万亿等都是汉字里面才有的单位，加上它们
int indexOfDot = cMoneyStringBuffer.indexOf(DOT);
int moneyPatternCursor = 1;
for (int i = indexOfDot - 1; i > 0; i--) {
cMoneyStringBuffer.insert(i, chineseMoneyPattern.get(EMPTY + moneyPatternCursor));
moneyPatternCursor = moneyPatternCursor == 8 ? 1 : moneyPatternCursor + 1;
}
String fractionPart = cMoneyStringBuffer.substring(cMoneyStringBuffer.indexOf("."));
cMoneyStringBuffer.delete(cMoneyStringBuffer.indexOf("."), cMoneyStringBuffer.length());
while (cMoneyStringBuffer.indexOf("零拾") != -1) {
cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零拾"), cMoneyStringBuffer.indexOf("零拾") + 2, ZERO);
}
while (cMoneyStringBuffer.indexOf("零佰") != -1) {
cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零佰"), cMoneyStringBuffer.indexOf("零佰") + 2, ZERO);
}
while (cMoneyStringBuffer.indexOf("零仟") != -1) {
cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零仟"), cMoneyStringBuffer.indexOf("零仟") + 2, ZERO);
}
while (cMoneyStringBuffer.indexOf("零万") != -1) {
cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零万"), cMoneyStringBuffer.indexOf("零万") + 2, TEN_THOUSAND);
}
while (cMoneyStringBuffer.indexOf("零亿") != -1) {
cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零亿"), cMoneyStringBuffer.indexOf("零亿") + 2, HUNDRED_MILLION);
}
while (cMoneyStringBuffer.indexOf("零零") != -1) {
cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零零"), cMoneyStringBuffer.indexOf("零零") + 2, ZERO);
}
if (cMoneyStringBuffer.lastIndexOf(ZERO) == cMoneyStringBuffer.length() - 1)
cMoneyStringBuffer.delete(cMoneyStringBuffer.length() - 1, cMoneyStringBuffer.length());
cMoneyStringBuffer.append(fractionPart);
result = cMoneyStringBuffer.toString();
return result;
}
private String addUnitsToChineseMoneyString(String moneyStr) {
String result;
StringBuffer cMoneyStringBuffer = new StringBuffer(moneyStr);
int indexOfDot = cMoneyStringBuffer.indexOf(DOT);
cMoneyStringBuffer.replace(indexOfDot, indexOfDot + 1, YUAN);
cMoneyStringBuffer.insert(cMoneyStringBuffer.length() - 1, JIAO);
cMoneyStringBuffer.insert(cMoneyStringBuffer.length(), FEN);
if (cMoneyStringBuffer.indexOf("零角零分") != -1)//没有零头，加整
cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零角零分"), cMoneyStringBuffer.length(), "整");
else
if (cMoneyStringBuffer.indexOf("零分") != -1)//没有零分，加整
cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零分"), cMoneyStringBuffer.length(), "整");
else {
if(cMoneyStringBuffer.indexOf("零角")!=-1)
cMoneyStringBuffer.delete(cMoneyStringBuffer.indexOf("零角"),cMoneyStringBuffer.indexOf("零角")+2);
// tmpBuffer.append("整");
}
result = cMoneyStringBuffer.toString();
return result;
}
private void checkPrecision(String moneyStr) {
int fractionDigits = moneyStr.length() - moneyStr.indexOf(DOT) - 1;
if (fractionDigits > 2)
throw new RuntimeException("金额" + moneyStr + "的小数位多于两位。"); //精度不能比分低
}
public static void main(String args[]) {
System.out.println(getInstance().format(new Double(10010001.01)));
}
}
3、继承时候类的执行顺序问题,一般都是选择题,问你将会打印出什么?
答:父类：
package test;
public class FatherClass {
public FatherClass() {
System.out.println("FatherClass Create");
}
}
子类:
package test;
import test.FatherClass;
public class ChildClass extends FatherClass {
public ChildClass() {
System.out.println("ChildClass Create");
}
public static void main(String[] args) {
FatherClass fc = new FatherClass();
ChildClass cc = new ChildClass();
}
}
输出结果：
C:>java test.ChildClass
FatherClass Create
FatherClass Create
ChildClass Create
4、内部类的实现方式?
答：示例代码如下：
package test;
public class OuterClass {
private class InterClass {
public InterClass() {
System.out.println("InterClass Create");
}
}
public OuterClass() {
InterClass ic = new InterClass();
System.out.println("OuterClass Create");
}
public static void main(String[] args) {
OuterClass oc = new OuterClass();
}
}
输出结果:
C:>java test/OuterClass
InterClass Create
OuterClass Create
再一个例题：
public class OuterClass {
private double d1 = 1.0;
//insert code here
}
You need to insert an inner class declaration at line 3. Which two inner class declarations are
valid?(Choose two.)
A. class InnerOne{
public static double methoda() {return d1;}
}
B. public class InnerOne{
static double methoda() {return d1;}
}
C. private class InnerOne{
double methoda() {return d1;}
}
D. static class InnerOne{
protected double methoda() {return d1;}
}
E. abstract class InnerOne{
public abstract double methoda();
}
说明如下：
一.静态内部类可以有静态成员，而非静态内部类则不能有静态成员。 故 A、B 错
二.静态内部类的非静态成员可以访问外部类的静态变量，而不可访问外部类的非静态变量；return d1 出错。故 D 错
三.非静态内部类的非静态成员可以访问外部类的非静态变量。 故 C 正确
四.答案为C、E
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