What are the ways to determine whether a string is an integer in Java?

一、使用Java自带的函数isDigit()函数

public static boolean isNumeric(String str){    
    for (int i = str.length();--i>=0;){       
        if (!Character.isDigit(str.charAt(i))){      
            return false;     
        }    
    }    
    return true;  
}

二、使用正则表达式

/*   
* 判断是否为整数    
* @param str 传入的字符串    
* @return 是整数返回true,否则返回false  
*/        
public static boolean isInteger(String str) {
        Pattern pattern = Pattern.compile("^[-\\+]?[\\d]*$");
        return pattern.matcher(str).matches();
}

三、使用ascii码

public static boolean isNumeric(String str){
     for(int i=str.length();--i>=0;){
             int chr=str.charAt(i);        
             if(chr<48 || chr>57){           
                 return false;     
             }     
     return true;  
}

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