java编程思想第四版第十三章字符串习题

第二题

package net.mindview.strings;

import java.util.ArrayList;

import java.util.List;

/**

 * 无限循环

 */

public class InfiniteRecursion {

    public InfiniteRecursion(){

    }

    @Override

    public String toString() {

        return " InfiniteRecursion address" + super.toString() + "\n";

    }

    public static void main(String[] args) {

        List<InfiniteRecursion> list = new ArrayList<InfiniteRecursion>();

        for(int i=; i<; i++){

            list.add(new InfiniteRecursion());

        }

        System.out.println(list);

    }

}

第四题

package net.mindview.strings;

import java.util.Formatter;

public class Receipt {

    private double total = ;

    private Formatter f = new Formatter(System.out);

    public final int ITEM_WIDTH = ;

    public final int QTY_WIDTH = ;

    public final int PRICE_WIDTH = ;

    public final int PRICISION_FLOAT_WIDHT = ;

    public final int PRICISION_String_WIDHT = ;

    public final String TITLE_FORMAT = "%-" + ITEM_WIDTH + "s %" + QTY_WIDTH

            + "s %" + PRICE_WIDTH + "s\n";

    public final String PRICE_FORMAT = "%-" + ITEM_WIDTH + "."

            + PRICISION_String_WIDHT + "s %" + QTY_WIDTH + "d %" + PRICE_WIDTH

            + "." + PRICISION_FLOAT_WIDHT + "f\n";

    public final String TOTAL_FORMAT = "%-" + ITEM_WIDTH + "s %" + QTY_WIDTH

            + "s %" + PRICE_WIDTH + "." + PRICISION_FLOAT_WIDHT + "f\n"; 

    //打印标题

    public void printTitle(){

        /*

         * 含义: 格式化字符串串以%开头

         * -: 表示左对齐

         * 15: 15表示宽度

         * s:表示数据的类型是String

         * .2f:表示浮点数保留的小数位数

         * .15s:表示字符串的长度最多15个字符

         */

        f.format(TITLE_FORMAT, "Item", "Qty", "Price");

        f.format(TITLE_FORMAT, "----", "---", "-----");

    }

    //正文的内容

    public void print(String name, int qty, double price){

        f.format(PRICE_FORMAT, name, qty, price);

        total += price;

    }

    //总价

    public void printTotal(){

        f.format(TOTAL_FORMAT, "Tax", "", total*0.06);

        f.format(TITLE_FORMAT, "", "", "-----");

        f.format(TOTAL_FORMAT, "Total", "", total*1.06);

    }

    public static void main(String[] args) {

        Receipt receipt = new Receipt();

        receipt.printTitle();

        receipt.print("Jack`s Magic Beans", , 4.25);

        receipt.print("Princess Peas", , 5.1);

        receipt.print("Three Bears Porridge", , 14.29);

        receipt.printTotal();

    }

}

运行结果：

Item              Qty      Price

----              ---      -----

Jack`s Magic Be            4.25

Princess Peas              5.10

Three Bears Por           14.29

Tax                         1.42

                           -----

Total                      25.06

第五题

package net.mindview.strings;

import java.util.Formatter;

public class Receipt {

    private double total = ;

    private Formatter f = new Formatter(System.out);

    public final int ITEM_WIDTH = ;

    public final int QTY_WIDTH = ;

    public final int PRICE_WIDTH = ;

    public final int PRICISION_FLOAT_WIDHT = ;

    public final int PRICISION_String_WIDHT = ;

    public final String TITLE_FORMAT = "%-" + ITEM_WIDTH + "s %" + QTY_WIDTH

            + "s %" + PRICE_WIDTH + "s\n";

    public final String PRICE_FORMAT = "%-" + ITEM_WIDTH + "."

            + PRICISION_String_WIDHT + "s %" + QTY_WIDTH + "d %" + PRICE_WIDTH

            + "." + PRICISION_FLOAT_WIDHT + "f\n";

    public final String TOTAL_FORMAT = "%-" + ITEM_WIDTH + "s %" + QTY_WIDTH

            + "s %" + PRICE_WIDTH + "." + PRICISION_FLOAT_WIDHT + "f\n"; 

    //打印标题

    public void printTitle(){

        /*

         * 含义: 格式化字符串串以%开头

         * -: 表示左对齐

         * 15: 15表示宽度

         * s:表示数据的类型是String

         * .2f:表示浮点数保留的小数位数

         * .15s:表示字符串的长度最多15个字符

         */

        f.format(TITLE_FORMAT, "Item", "Qty", "Price");

        f.format(TITLE_FORMAT, "----", "---", "-----");

    }

    //正文的内容

    public void print(String name, int qty, double price){

        f.format(PRICE_FORMAT, name, qty, price);

        total += price;

    }

    //总价

    public void printTotal(){

        f.format(TOTAL_FORMAT, "Tax", "", total*0.06);

        f.format(TITLE_FORMAT, "", "", "-----");

        f.format(TOTAL_FORMAT, "Total", "", total*1.06);

    }

    public static void main(String[] args) {

        Receipt receipt = new Receipt();

        receipt.printTitle();

        receipt.print("Jack`s Magic Beans", , 4.25);

        receipt.print("Princess Peas", , 5.1);

        receipt.print("Three Bears Porridge", , 14.29);

        receipt.printTotal();

    }

}

运行结果:

Item              Qty      Price

----              ---      -----

Jack`s Magic Be            4.25

Princess Peas              5.10

Three Bears Por           14.29

Tax                         1.42

                           -----

Total                      25.06

第七题:

package net.mindview.strings.test7;

public class Test7 {

    public static void main(String[] args) {

        //两种写法都可以

        String regex = "^[A-Z].*\\.$";

        String regex1 = "\\p{Upper}.*\\.$";

        String str = "D.";

        String str1 = "Dfasdfasfasfdasfdasfasfasdf.";

        String str2 = "Dfasdfasfasfdasfdasfasfasdf.E";

        System.out.println(str.matches(regex));

        System.out.println(str1.matches(regex));

        System.out.println(str2.matches(regex));

        System.out.println(str.matches(regex1));

        System.out.println(str1.matches(regex1));

        System.out.println(str2.matches(regex1));

    }

}

运行结果:

true

true

false

true

true

false

第八题

package net.mindview.strings;

import java.util.Arrays;

public class Splitting {

    public static String knights = "Then, when you have found the shrubbery, you must cut down the mightiest tree in the forest... with... a herring!";

    public static void split(String regex){

        System.out.println(Arrays.toString(knights.split(regex)));

    }

    public static void main(String[] args) {

        //表示的时按照空格分割字符串

        //运行结果:[Then,, when, you, have, found, the, shrubbery,, you, must, cut, down, the, mightiest, tree, in, the, forest..., with..., a, herring!]

        split(" ");

        //表示按照非单次字符分割字符串--这里的非单次字符是空格和,

        //运行结果:[Then, when, you, have, found, the, shrubbery, you, must, cut, down, the, mightiest, tree, in, the, forest, with, a, herring]

        split("\\W+");

        //这个表示:费单次字符之前带n的地方进行分割字符串 这里的分割符是n空格和n,

        //运行结果:[The, whe, you have found the shrubbery, you must cut dow, the mightiest tree i, the forest... with... a herring!]

        split("n\\W+");

    }

}

package net.mindview.strings.test8;

import net.mindview.strings.Splitting;

public class Test8 {

    public static void main(String[] args) {

        String regex = "the|you";

        Splitting.split(regex);

    }

}

第九题

package net.mindview.strings.test9;

import net.mindview.strings.Splitting;

public class Test9 {

    public static void main(String[] args) {

        String regex = "A|E|I|O|U|a|e|i|o|u";

        //通过嵌入式标志表达式  (?i) 也可以启用不区分大小写的匹配。

        String regex1 = "(?i)a|e|i|o|u";

        //[abc] 表示a或b或c

        String regex2 = "(?i)[aeiou]";

        System.out.println(Splitting.knights.replaceAll(regex, "_"));

        System.out.println(Splitting.knights.replaceAll(regex1, "_"));

        System.out.println(Splitting.knights.replaceAll(regex2, "_"));

    }

}

第十题

package net.mindview.strings.test10;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class Test10 {

    public static void main(String[] args) {

        String str = "Java now has regular expressions";

        for(String arg: args){

            Pattern p = Pattern.compile(arg);

            Matcher m = p.matcher(str);

            while(m.find()){

                System.out.println("Match \"" + m.group() +"\" at positions " + m.start() + "-" + (m.end()-) );

            }

            System.out.println("\n");

        }

    }

}

输入参数:

^Java

\Breg.*

n.w\s+h(a|i)s

s?

s*

s+

s{}

s{}.

s{,}

输出结果

Match "Java" at positions -

Match "now has" at positions -

Match "" at positions --

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "s" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "s" at positions -

Match "s" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "s" at positions -

Match "" at positions -

Match "s" at positions -

Match "ss" at positions -

Match "s" at positions -

Match "s " at positions -

Match "ss" at positions -

Match "" at positions --

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "s" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "ss" at positions -

Match "" at positions -

Match "" at positions -

Match "" at positions -

Match "s" at positions -

Match "" at positions -

第十一题

package net.mindview.strings.test11;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class Test11 {

    public static void main(String[] args) {

        Pattern p = Pattern.compile("(?i)((^[aeiou])|(\\s+[aeiou]))\\w+?[aeiou]\\b");

        Matcher m = p.matcher("Arline ate eight apples and " +

"one orange while Anita hadn't any");

        while(m.find()){

            System.out.println("Match \"" + m.group() +

                    "\" at positions " + m.start() + "-" +

                    (m.end() - ));

        }

    }

}

运行结果:

Match "Arline" at positions -

Match " ate" at positions -

Match " one" at positions -

Match " orange" at positions -

Match " Anita" at positions -

sfa
f
a
fda
sdf
af
a
fd
af
as
fd
asfd
af
da
f
df
as
fa
sf
asf
a
sf
af
asf

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