Java左右补齐字符长度

Java左右补齐字符长度，如果是数字左补齐0的话可以用：String.format("0x%08X", i); //示例是把整数 i 转换成16进制的数字，不足8位左补0。具体代码如下：

 

/**

* 字符串补齐

* @param source 源字符串

* @param fillLength 补齐长度

* @param fillChar 补齐的字符

* @param isLeftFill true为左补齐，false为右补齐

* @return

*/

public static String stringFill(String source, int fillLength, char fillChar, boolean isLeftFill) {

if (source == null || source.length() >= fillLength) return source;

 

StringBuilder result = new StringBuilder(fillLength);

int len = fillLength - source.length();

if (isLeftFill) {

for (; len > 0; len--) {

result.append(fillChar);

}

result.append(source);

} else {

result.append(source);

for (; len > 0; len--) {

result.append(fillChar);

}

}

return result.toString();

}

 

public static String stringFill2(String source, int fillLength, char fillChar, boolean isLeftFill) {

if (source == null || source.length() >= fillLength) return source;

 

char[] c = new char[fillLength];

char[] s = source.toCharArray();

int len = s.length;

if(isLeftFill){

int fl = fillLength - len;

for(int i = 0; i<fl; i++){

c[i] = fillChar;

}

System.arraycopy(s, 0, c, fl, len);

}else{

System.arraycopy(s, 0, c, 0, len);

for(int i = len; i<fillLength; i++){

c[i] = fillChar;

}

}

return String.valueOf(c);

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