- it技术
- java语言程序设计（进阶版）21.6 21.10 HashMap
package com
.wenchi
;
import java
.util
.HashMap
;
import java
.util
.Iterator
;
import java
.util
.Scanner
;
import java
.util
.TreeMap
;
public class Demo01 {
public static void main(String
[] args
) {
HashMap
<Integer, Integer> hashMap
= new HashMap<>();
Scanner input
= new Scanner(System
.in
);
int t
;
while ((t
= input
.nextInt()) != 0) {
if (hashMap
.containsKey(t
))
hashMap
.put(t
, hashMap
.get(t
).intValue() + 1);
else
hashMap
.put(t
, 1);
}
Iterator itr
= hashMap
.keySet().iterator();
int max
= 0;
while (itr
.hasNext()) {
if ((t
= hashMap
.get(itr
.next()))>max
) {
max
= t
;
}
}
int finalMax
= max
;
hashMap
.keySet().forEach(i
->{
if(hashMap
.get(i
) == finalMax
)
System
.out
.println(i
+ " : " + hashMap
.get(i
));
});
}
}
package com
.wenchi
;
import java
.io
.*
;
import java
.util
.*
;
public class text {
public static void main(String
[] args
) throws Exception
{
Scanner input
= new Scanner(System
.in
);
System
.out
.println("Enter a Java source file name:");
String filename
= input
.nextLine();
File file
= new File(filename
);
if (file
.exists()) {
System
.out
.println("The number of keywords in " + filename
+ " is " + wordTime(file
));
} else {
System
.out
.println("File " + filename
+ " does not exit");
}
}
public static int wordTime(File file
) throws Exception
{
String
[] keywordString
= {"abstract", "assert", "boolean", "break", "byte", "case", "catch", "char", "class", "const",
"continue", "default", "do", "double", "else", "enum", "extends", "final", "finally", "float", "for", "goto", "if",
"implements", "import", "instanceof", "int", "interface", "long", "native", "new", "package", "private",
"protected", "public", "return", "strictfp", "short", "static", "super", "switch", "synchronized", "this",
"throw", "throws", "transient", "try", "void", "volatile", "while"};
Set
<String> workTimeSet
= new HashSet<>(Arrays
.asList(keywordString
));
int count
= 0;
BufferedReader in
= new BufferedReader(new FileReader(file
));
String str
= null
;
boolean flag1
= false,flag2
= false;
while ((str
= in
.readLine()) != null
) {
int t
= 0;
if (str
.contains("//")) {
str
.replace("{", " ").replace("}", " ").replace("(", " ").replace(")", " ").replace("[", " ").replace(";", " ");
str
= str
.substring(0, str
.indexOf("//"));
} else if (str
.contains("/*")) {
str
= str
.substring(0, str
.indexOf("/*"));
flag1
= true;
} else if (str
.contains("*/")) {
str
= str
.substring(0, str
.indexOf("*/"));
flag1
= false;
}
String
[] strs
= str
.split(" ");
System
.out
.println(str
);
if(flag2
== false)
for(String s
: strs
){
System
.out
.println("."+s
);
if(workTimeSet
.contains(s
))
count
++;
}
flag2
= flag1
;
}
in
.close();
return count
;
}
}
