public class TestSubstring {

    public static void main(String[] args) {
        //1 如何将字符串的首字母和尾字母转化成大写
        String temp1 = "myproject";
        String upString1 = temp1.substring(0,1).toUpperCase();
        String upString2 = temp1.substring(temp1.length()-1,temp1.length()).toUpperCase();
        String middle = temp1.substring(1,temp1.length()-1);
        String result1 = upString1+middle+upString2;
        System.out.println("result1 = "+result1);
        //2 如何将字符串中的所有a替换成*
        String temp2 = "mynameisapple";
        String result2 = temp2.replace('a','*');
        System.out.println("result2 = "+result2);
        //3 如果字符串中包含子串src,如何取得第一个子串src后的所有字符
        String temp3 = "D:/myproject/src/a/b/src";
        String result3 = temp3.substring(temp3.indexOf("src/")+4,temp3.length());
        System.out.println("result3 = "+result3);
    }

}

result1 = MyprojecT
result2 = myn*meis*pple
result3 = a/b/src