判断java标识符

• Z时代
• 2024-01-10
• 分类：综合

 1package com.jdk7.chapter5;
 2
 3publicclass JavaIdentifier {
 4
 5/**
 6     * 使用Character.isJavaIdentifierPart判断字符是否属于java标识符
 7        it is a letter 
 8        it is a currency symbol (such as '$') 
 9        it is a connecting punctuation character (such as '_') 
10        it is a digit 
11        it is a numeric letter (such as a Roman numeral character) 
12        it is a combining mark 
13        it is a non-spacing mark 
14        '\u005Cu0000' through '\u005Cu0008' 
15        '\u005Cu000E' through '\u005Cu001B' 
16        '\u005Cu007F' through '\u005Cu009F' 
17     * @param str
18     * @return
19*/
20publicstaticboolean isJavaIdentifier(String str){
21if(str==null || str.length()==0){
22returnfalse;
23        }
24char[] ch = str.toCharArray();
25for(int i=0;i<ch.length;i++){
26if(!(Character.isJavaIdentifierPart(ch[i]))){
27returnfalse;
28            }
29        }
30returntrue;
31    }
32
33publicstaticvoid main(String[] args) {
34         System.out.println("my_var is an identifier? "+JavaIdentifier.isJavaIdentifier("my_var"));
35         System.out.println("$my_var is an identifier? "+JavaIdentifier.isJavaIdentifier("$my_var"));
36         System.out.println("my_var.1 is an identifier? "+JavaIdentifier.isJavaIdentifier("my_var.1"));
37         System.out.println("1$my_var is an identifier? "+JavaIdentifier.isJavaIdentifier("1$my_var"));
38         System.out.println("u0391var is an identifier? "+JavaIdentifier.isJavaIdentifier("u0391var"));
39         System.out.println("null is an identifier? "+JavaIdentifier.isJavaIdentifier(null));
40         System.out.println("null is an identifier? "+JavaIdentifier.isJavaIdentifier(" "));
41    }
42}
43
44
45执行结果：
46 my_var is an identifier? true
47 $my_var is an identifier? true
48 my_var.1 is an identifier? false
49 1$my_var is an identifier? true
50 u0391var is an identifier? true
51null is an identifier? false
52null is an identifier? false

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