Question

如何将字符串转换为字符数组但有一点扭曲：只应将大写字母放入字符数组中。

例如，

输入字符串："abCcAB123"
输出字符数组：{C,A,B}

Answer 1

删除所有非大写字母，然后转换为char数组。

String str = "abCcAB";
String a = str.replaceAll( "[^A-Z]", "" );
System.out.println(a.toCharArray());

Answer 2

你可以这样做：

public static void main(String[] args) {
        String s="ab !@#$&*()//CcAB897987";
         List upperChar=new ArrayList();
         String a = s.replaceAll( "[^A-Z\\-]", "" );  // remove all character other Uppercase character
         char []ch=a.toCharArray();              // this contains all uppercase character
         for (int i = 0; i < ch.length; i++) {
               upperChar.add(ch[i]);             // make a list of uppercase char.
         }

           System.out.println(upperChar);

 }

输出：

[C, A, B]

Answer 3

psedocode：

    queue output; //declaration of the character array for output
    while(input.length!=0){ //checking the length of the input array
        firstcharacter=string.charAt(0); //getting the firstCharacter of the input string
        if(character.IsUpperCase(firtcharacter)){ //checking if the firstCharacter is uppercase
            output.enqueue(firtcharacter); //if the character is uppercase add to the array
        }
        input=input.substring(1,string.length); //remove the first character from the string
    }
//output should now contain all the uppercase characters.

这是解决问题的逻辑。

Answer 4

试试这个：

public class CaptialChars {
    public static void main(String[] args){
        String input="SaGaR";
        char[] output=input.replaceAll("[a-z]", "").toCharArray();
        for(char character:output){
            System.out.println(character);
        }

    }
}

从字符串中选择大写字母并将其转换为字符数组

4 个答案: