Java string string 0 or space

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package cn.com.songjy;

import java.text.NumberFormat;
//Java 中给数字左边补0
public class NumberFormatTest {

	public static void main(String[] args) {
		// 待测试数据
		int i = 1;
		// 得到一个NumberFormat的实例
		NumberFormat nf = NumberFormat.getInstance();
		// 设置是否使用分组
		nf.setGroupingUsed(false);
		// 设置最大整数位数
		nf.setMaximumIntegerDigits(4);
		// 设置最小整数位数
		nf.setMinimumIntegerDigits(4);
		// 输出测试语句
		System.out.println(nf.format(i));
	}
}

/**  
 * Java里数字转字符串前面自动补0的实现。  
 *    
 */  
public class TestStringFormat {   
  public static void main(String[] args) {   
    int youNumber = 1;   
    // 0 代表前面补充0   
    // 4 代表长度为4   
    // d 代表参数为正数型   
    String str = String.format("%04d",youNumber);   
    System.out.println(str); // 0001   
  }   
}  

//流水号加1后返回，流水号长度为4
	private static final String STR_FORMAT = "0000"; 

	public static String haoAddOne_2(String liuShuiHao){
	    Integer intHao = Integer.parseInt(liuShuiHao);
	    intHao++;
	    DecimalFormat df = new DecimalFormat(STR_FORMAT);
	    return df.format(intHao);
	}

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