关于java生成科学计数法的数，一个demo程序如下。

package cn.com.happyever.remit.tools;

import java.math.BigDecimal;

public class Test {

	public static void main(String[] args) {
		String temp1 = "1000000000";
		Double double1 = (new Double(temp1))/100*-1;
		System.out.println("double1>"+double1);

		String temp2 = "900000099";
		Double double2 = (new Double(temp2))/100*-1;
		System.out.println("double2>"+double2);

		/*output:
			double1>-1.0E7
			double2>-9000000.99*/
		//解决方案：
		String temp3 = "1000000000";
		BigDecimal bd2 = new BigDecimal("0.01");
		BigDecimal amount = BigDecimal.valueOf(-Long.valueOf(temp3)); 
		String strAmount = amount.multiply(bd2).toString();// 金额单位(元)
		System.out.println("strAmount>"+strAmount);
		/*output:strAmount>-10000000.00*/
	}

}