stringandstringbuffer1.java

Java 程序设计源码 只提供了部分

public class StringAndStringBuffer1 {
	public static void main(String[] args) {
		long startTime = System.currentTimeMillis();
		long startMem = Runtime.getRuntime().freeMemory();
		String str = new String();

		for(int i = 0; i < 1000; i++)
			str += "a";

		long endMem = Runtime.getRuntime().freeMemory();
		
		System.out.println("use memory:" + (startMem - endMem));

		long endTime = System.currentTimeMillis();

		System.out.println("use time:" + (endTime - startTime));
			
	}


}