java实验4代码含测试效果

题目再现

    //Lab4-1反转字符串
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String str = sc.next();
        str = new StringBuffer(str).reverse().toString();
        System.out.println(str);
    }

题目再现：

    //Lab4-2文本中查找字符串
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        String pattern = sc.next();
        for(int i =0;i 
题目3–替换字符串 
题目再现
 
 完整代码
 
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        String pattern = sc.next();
        int cnt = 0;

        String des = sc.next();
        for(int i =0;i 
实验效果
 
 
实验4-十六进制互转 
 
public static void main(String[] args) {
            while(true){
                System.out.println("1、for hex to decn2、for dec to hex");
                Scanner scanner = new Scanner(System.in);
                int n = Integer.parseInt(scanner.nextLine());
                if (n == 2){
                    System.out.println("Enter a dec string:");
                    int d = scanner.nextInt();
                    String s = Integer.toHexString(d).toUpperCase();
                    System.out.println("Decimal value for hex string:"+s);
                }else {
                    System.out.println("Enter a hex string:");
                    String h = scanner.nextLine();
                    int i = Integer.parseInt(h, 16);
                    System.out.println("hex value value to dec string："+i);
                }
            }
        }