标签：java String FORMAT positions WIDTH 第四版 习题 public Match

1. fas
2. 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=0; i<5; i++){
               list.add(new InfiniteRecursion());
           }
           System.out.println(list);
       }
   }

    

3. fa
4. 第四题

   package net.mindview.strings;
   
   import java.util.Formatter;
   
   public class Receipt {
       private double total = 0;
       private Formatter f = new Formatter(System.out);
       public final int ITEM_WIDTH = 15;
       public final int QTY_WIDTH = 5;
       public final int PRICE_WIDTH = 10;
       public final int PRICISION_FLOAT_WIDHT = 2;
       public final int PRICISION_String_WIDHT = 15;
       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, 4.25);
           receipt.print("Princess Peas", 3, 5.1);
           receipt.print("Three Bears Porridge", 1, 14.29);
           receipt.printTotal();
       }
   
   }

   运行结果：

   Item              Qty      Price
   ----              ---      -----
   Jack`s Magic Be     4       4.25
   Princess Peas       3       5.10
   Three Bears Por     1      14.29
   Tax                         1.42
                              -----
   Total                      25.06

    

5. 第五题

   package net.mindview.strings;
   
   import java.util.Formatter;
   
   public class Receipt {
       private double total = 0;
       private Formatter f = new Formatter(System.out);
       public final int ITEM_WIDTH = 15;
       public final int QTY_WIDTH = 5;
       public final int PRICE_WIDTH = 10;
       public final int PRICISION_FLOAT_WIDHT = 2;
       public final int PRICISION_String_WIDHT = 15;
       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, 4.25);
           receipt.print("Princess Peas", 3, 5.1);
           receipt.print("Three Bears Porridge", 1, 14.29);
           receipt.printTotal();
       }
   
   }

   运行结果:

   Item              Qty      Price
   ----              ---      -----
   Jack`s Magic Be     4       4.25
   Princess Peas       3       5.10
   Three Bears Por     1      14.29
   Tax                         1.42
                              -----
   Total                      25.06

    

6. afd
7. 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

    

8. 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);
       }
   }

    

9. 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, "_"));
       }
   }

    

10. 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()-1) );
                }
                System.out.println("\n");
            }
            
        }
    }

    输入参数:

    ^Java
    \Breg.*
    n.w\s+h(a|i)s
    s?
    s*
    s+
    s{4}
    s{1}.
    s{0,3}

    输出结果

    Match "Java" at positions 0-3
    
    
    
    
    Match "now has" at positions 5-11
    
    
    Match "" at positions 0--1
    Match "" at positions 1-0
    Match "" at positions 2-1
    Match "" at positions 3-2
    Match "" at positions 4-3
    Match "" at positions 5-4
    Match "" at positions 6-5
    Match "" at positions 7-6
    Match "" at positions 8-7
    Match "" at positions 9-8
    Match "" at positions 10-9
    Match "s" at positions 11-11
    Match "" at positions 12-11
    Match "" at positions 13-12
    Match "" at positions 14-13
    Match "" at positions 15-14
    Match "" at positions 16-15
    Match "" at positions 17-16
    Match "" at positions 18-17
    Match "" at positions 19-18
    Match "" at positions 20-19
    Match "" at positions 21-20
    Match "" at positions 22-21
    Match "" at positions 23-22
    Match "" at positions 24-23
    Match "" at positions 25-24
    Match "s" at positions 26-26
    Match "s" at positions 27-27
    Match "" at positions 28-27
    Match "" at positions 29-28
    Match "" at positions 30-29
    Match "s" at positions 31-31
    Match "" at positions 32-31
    
    
    
    
    Match "s" at positions 11-11
    Match "ss" at positions 26-27
    Match "s" at positions 31-31
    
    
    
    
    Match "s " at positions 11-12
    Match "ss" at positions 26-27
    
    
    Match "" at positions 0--1
    Match "" at positions 1-0
    Match "" at positions 2-1
    Match "" at positions 3-2
    Match "" at positions 4-3
    Match "" at positions 5-4
    Match "" at positions 6-5
    Match "" at positions 7-6
    Match "" at positions 8-7
    Match "" at positions 9-8
    Match "" at positions 10-9
    Match "s" at positions 11-11
    Match "" at positions 12-11
    Match "" at positions 13-12
    Match "" at positions 14-13
    Match "" at positions 15-14
    Match "" at positions 16-15
    Match "" at positions 17-16
    Match "" at positions 18-17
    Match "" at positions 19-18
    Match "" at positions 20-19
    Match "" at positions 21-20
    Match "" at positions 22-21
    Match "" at positions 23-22
    Match "" at positions 24-23
    Match "" at positions 25-24
    Match "ss" at positions 26-27
    Match "" at positions 28-27
    Match "" at positions 29-28
    Match "" at positions 30-29
    Match "s" at positions 31-31
    Match "" at positions 32-31

     

11. 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() - 1));
            }
        }
    }    

    运行结果:

    Match "Arline" at positions 0-5
    Match " ate" at positions 6-9
    Match " one" at positions 27-30
    Match " orange" at positions 31-37
    Match " Anita" at positions 44-49

     

12. sfa
13. f
14. a
15. fda
16. sdf
17. af
18. a
19. fd
20. af
21. as
22. fd
23. asfd
24. af
25. da
26. f
27. df
28. as
29. fa
30. sf
31. asf
32. a
33. sf
34. af
35. asf

标签：java,String,FORMAT,positions,WIDTH,第四版,习题,public,Match
来源： https://blog.51cto.com/u_15091061/2856404

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