一、前言

通过jfinal3.0的源码com.jfinal.kit.JavaKeyword关键词定义类通过Collections.unmodifiableSet将常用java关键词注入java.util.Set类集中不让修改，只允增加和删除等操作，详情参见源码说明

二、源码说明

package com.jfinal.kit;@b@@b@import java.util.Collections;@b@import java.util.HashSet;@b@import java.util.Set;@b@import com.jfinal.kit.StrKit;@b@@b@/**@b@ * JavaKeyword.@b@ */@b@public class JavaKeyword {@b@	@b@	private String[] keywordArray = {@b@		"abstract",@b@		"assert",@b@		"boolean",@b@		"break",@b@		"byte",@b@		"case",@b@		"catch",@b@		"char",@b@		"class",@b@		"const",@b@		"continue",@b@		"default",@b@		"do",@b@		"double",@b@		"else",@b@		"enum",@b@		"extends",@b@		"final",@b@		"finally",@b@		"float",@b@		"for",@b@		"goto",@b@		"if",@b@		"implements",@b@		"import",@b@		"instanceof",@b@		"int",@b@		"interface",@b@		"long",@b@		"native",@b@		"new",@b@		"package",@b@		"private",@b@		"protected",@b@		"public",@b@		"return",@b@		"strictfp",@b@		"short",@b@		"static",@b@		"super",@b@		"switch",@b@		"synchronized",@b@		"this",@b@		"throw",@b@		"throws",@b@		"transient",@b@		"try",@b@		"void",@b@		"volatile",@b@		"while"@b@	};@b@	@b@	private Set<String> set;@b@	@b@	public static final JavaKeyword me = createSharedInstance();@b@	@b@	private static JavaKeyword createSharedInstance() {@b@		JavaKeyword jk = new JavaKeyword();@b@		jk.set = Collections.unmodifiableSet(jk.set);	// 共享对象不让修改@b@		return jk;@b@	}@b@	@b@	public JavaKeyword() {@b@		set = new HashSet<String>();@b@		for (String keyword : keywordArray) {@b@			set.add(keyword);@b@		}@b@	}@b@	@b@	public JavaKeyword addKeyword(String keyword) {@b@		if (StrKit.notBlank(keyword)) {@b@			set.add(keyword);@b@		}@b@		return this;@b@	}@b@	@b@	public JavaKeyword removeKeyword(String keyword) {@b@		set.remove(keyword);@b@		return this;@b@	}@b@	@b@	public boolean contains(String str) {@b@		return set.contains(str);@b@	}@b@}