Java

为Eclipse指定JDK

Categories: Java; Tagged with: Eclipse • Java • JDK; @ March 27th, 2010 15:23

菜鸟上路记.

Java: 计算平均分, 标准差, 标准分

Categories: Java; Tagged with: Java • 平均分 • 标准分 • 标准差; @ January 27th, 2010 21:45

本类提供标准差,标准分计算的Utility.

(more…)

Java 保持小数点后若干位的操作

Categories: Java; Tagged with: Java; @ January 26th, 2010 15:18

	DecimalFormat df2  = new DecimalFormat("###.00");

or:

(double) (Math.round(sd3*100)/100.0);

09下高一期终语文-平均分	09下期终英语-平均分	09高一下期中考试-平均分
71.66666666666667	124.0	195.66666666666666

09下高一期终语文-平均分	09下期终英语-平均分	09高一下期中考试-平均分
71.67	124.00	195.67

Java: Map遍历

Categories: Java; Tagged with: HashMap • Java • map; @ January 26th, 2010 10:43

		// 2. 遍历map中所有的元素
		Iterator>> iter = mapSheet.entrySet().iterator();
		while(iter.hasNext()) {
			Entry> entry = iter.next();
			int sheetIndex = entry.getKey(); // Key
			List listReportItems = entry.getValue(); // Value

		}

Java: StringTokenizer VS Split

Categories: Java; Tagged with: split() • StringTokenizer; @ April 17th, 2009 21:52

两个的差别:

	public static void main(String[] args) {
		String str = "1,2,,3";
		String delimiter = ",";
		StringTokenizer tokens = new StringTokenizer(str, delimiter);
		while(tokens.hasMoreTokens()) {
			System.out.println(tokens.nextToken());
		}

		System.out.println("---------无聊的分割线---------");
		String[] result = str.split(delimiter);
		for (int i = 0; i < result.length; i++) {
			System.out.println(result[i]);
		}
	}

输出：

———无聊的分割线———

空

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