java字符串去除开头的0

one：字符串转整形
String tempStr = "0000123"; 
int result = Integer.parseInt(tempStr); 
two：字符串替换
String str = "0000123";  
String newStr = str.replaceFirst("^0*", "");  
System.out.println(newStr);
three：同样字符串替换
String str = "0000123";  
String newStr = str.replaceAll("^(0+)", "");  
System.out.println(newStr);