String類方法練習－Cedric's 學習備忘錄

public class TestString {

    public static void main(String[] args) {
       String s1 = "AaaaABBBBcc&^%adfsfdCCOOkk99876 _haHA";
       char cr;
       int a = 0, b = 0, c = 0;

       for(int i=0; i<s1.length(); i++) {
           cr = s1.charAt(i);
           if(cr >= 'a' && c<= 'z'){
               b++;
           } else if(cr >= 'A' && c<= 'Z') {
               a++;
           } else {
               c++;
           }
       }


       for(int i=0; i<s1.length(); i++){
           cr = s1.charAt(i);
           if(Character.isLowerCase(cr)) {
               a++;
           } else if(Character.isUpperCase(cr)) {
               b++;
           } else {
               c++;
           }
       }
           System.out.println("字串共有" + s1.length() + "個字");
           System.out.println("大寫字母數有：" + a + "個");
           System.out.println("小寫字母數有：" + b + "個");
           System.out.println("其他符號有：" + c + "個");
           System.out.println();

    String s2 = "sunjavahpjavaokjavajjavahahajavajavagoodjava";
    String s3 = "java";
    int index = -1, count = 0;

    while((index = s2.indexOf(s3)) != -1) {
       s2 = s2.substring(index + s3.length());
       count ++;
    }
    System.out.println("共找到\"" + count + "\"個java字串");

    }//main end


}//class end

public class TestCase {

    public static void main(String[] args) {
       double[][] d;
       String s = "1,2;3,4,5;6,7,8";
       String[] s1 = s.split(";");

       for(int i=0; i<s1.length; i++) {
           d = new double[s1.length][];
           String[] s2 = s1[i].split(",");
           for(int j=0; j<s2.length; j++){
               d[i] = new double[s2.length];
               d[i][j] = Double.parseDouble(s2[j]);
               System.out.print(d[i][j] + " ");
           }
           System.out.println();
       }


    }


}