Educoder -Java面向对象 - String类各关题目答案

痛定思痛。 2023-01-13 04:18 186阅读 0赞

## 第1关：length()方法与compareTo()方法的使用 - 花名册 ##

package step1;
    
    import java.util.Scanner;
    
    public class Roster {
        
        public static void main(String[] args) {
        
            Scanner scanner = new Scanner(System.in);
            /********** Begin *********/
            String roster1 = new String(scanner.nextLine());
            String roster2 = new String(scanner.nextLine());
            System.out.println(roster1.length());
            System.out.println(roster2.length());
            if(roster1.compareTo(roster2)==0){
        
                System.out.println("相同");
            }else{
        
                System.out.println("不相同");
            }
    
    
            /********** End *********/
        }
    }

## 第2关：substring()方法与indexOf()方法的使用 - 姓名查找 ##

package step2;
    
    import java.util.Scanner;
    
    public class NameSearch {
        
        public static void main(String[] args) {
        
            Scanner scanner = new Scanner(System.in);
            /********** Begin *********/
            int i,j,r;
            int count=-2;
            String date = scanner.next();
            String name = scanner.next();
            for(i=0,j=0,r=2;(i!=-1)&&(i+r!=j);){
        
            j = date.length();
            r = name.length();
            i = date.indexOf(name);
            count = i+count+r;
            System.out.println(count);
            date=date.substring(i+r,j);
            }
            /********** End *********/
        }
    }

## 第3关：String串类操作练习 - 文件名与邮箱验证 ##

package step3;
    import java.util.Scanner;
    public class HelloWorld {
        
        
    	public void judge(String fileName,String email){
        
    		//请在此添加实现代码
    /********** Begin **********/
        String last1="1";
        String last2="2";
        String last3="3";
        String last4="4";
        int i1 = fileName.length();
        if(i1<=5){
        
            System.out.println("Java文件名无效");   
        }else{
        
        last1 = ".java";
        last2 = fileName.substring(i1-5,i1);
        }
        if(last1.equals(last2)){
        
            System.out.println("Java文件名正确");
        }else if(i1>5) {
        
            System.out.println("Java文件名无效");
        }
        int o1=email.lastIndexOf("@");
        int o2=email.lastIndexOf(".");
        int i2=email.length();
        if(i2<=4){
        
            System.out.println("邮箱名无效");
        }else{
        
        last3=".com";
        last4=email.substring(i2-4,i2);
        }
        if((o1<o2)&&last3.equals(last4)){
        
            System.out.println("邮箱名正确");
        }else if(i2>4){
        
            System.out.println("邮箱名无效");
        }
    /********** End **********/
        }
    	
    	
    }

## 第4关：StringBuffer类的定义和使用 - 字母反转 ##

package step4;

public class Reverse \{  
public static StringBuffer start(String data) \{  
StringBuffer ans = new StringBuffer();  
/\*\*\*\*\*\*\*\*\*\* Begin \*\*\*\*\*\*\*\*\*/

String [] words = data.split(" ");
        for(int i=0;i<words.length;i++){
            StringBuffer wordcaps=new StringBuffer(words[i]);
            ans.append(wordcaps.reverse());
            ans.append(" ");
        }
        
    
    
        /********** End *********/
        return ans;
    }