性能测试（做反射时，拼setter方法想到的）

package test.reflection;

public class ReflectionDemo3 {

	public static void main(String args[]){
		String str="name";
		createSetter(str);
		createSetter0(str);
		createSetter2(str);
		createSetter3(str);
		createSetter4(str);
		/**
		 * 运行结果
			createSetter:	1522 	 Name
			createSetter0:	1864 	 Name
			createSetter2:	3711 	 Name
			createSetter3:	1073 	 Name
			createSetter3:	884 	 Name
		 */
	}

	public static void createSetter(String str){
		long t1=System.currentTimeMillis();
		StringBuffer buf=null;
		for(int i=0;i<9999999;i++){
			buf=new StringBuffer(str);
			char c=buf.charAt(0);
			String s=String.valueOf(c).toUpperCase();
			buf=buf.replace(0, 1,s );
		}
		long t2=System.currentTimeMillis();
		System.out.println("createSetter:\t"+(t2-t1)+" \t "+buf);
	}

	public static void createSetter0(String str){
		long t1=System.currentTimeMillis();
		StringBuffer buf=null;
		for(int i=0;i<9999999;i++){
			buf=new StringBuffer(str);
			char c=buf.charAt(0);
			String s=String.valueOf(c).toUpperCase();
			buf.delete(0,1).insert(0, s);
		}
		long t2=System.currentTimeMillis();
		System.out.println("createSetter0:\t"+(t2-t1)+" \t "+buf);
	}

	public static void createSetter2(String str){
		long t1=System.currentTimeMillis();
		for(int i=0;i<9999999;i++){
			char c=str.charAt(0);
			String s=String.valueOf(c);
			String su=s.toUpperCase();
			str=str.replaceFirst(s, su);
		}
		long t2=System.currentTimeMillis();
		System.out.println("createSetter2:\t"+(t2-t1)+" \t "+str);
	}

	public static void createSetter3(String str){
		long t1=System.currentTimeMillis();
		String newStr=null;
		for(int i=0;i<9999999;i++){
			newStr=str.substring(0, 1).toUpperCase()+str.substring(1);
		}
		long t2=System.currentTimeMillis();
		System.out.println("createSetter3:\t"+(t2-t1)+" \t "+newStr);
	}

	public static void createSetter4(String str){
		long t1=System.currentTimeMillis();
		StringBuffer buf=null;
		for(int i=0;i<9999999;i++){
			buf=new StringBuffer();
			buf.append(str.substring(0, 1).toUpperCase());
			buf.append(str.substring(1));
		}
		long t2=System.currentTimeMillis();
		System.out.println("createSetter3:\t"+(t2-t1)+" \t "+buf);
	}
}