EduCoder Java程序设计---Java面向对象（第七章）- String类

た入场券 2023-09-30 12:45 17阅读 0赞

**第1关 [length()方法与compareTo()方法的使用 - 花名册][length_compareTo_ -]**

package step1;
    
    import java.util.Scanner;
    
    public class Roster {
        public static void main(String[] args) {
            Scanner scanner = new Scanner(System.in);
            /********** Begin *********/
            String s1 = scanner.nextLine();
            String s2 = scanner.nextLine();
            int len1 = s1.length();
            int len2 = s2.length();
            System.out.println(len1);
            System.out.println(len2);
            if (s1.compareTo(s2)==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][substring_indexOf_ -]**

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

**第3关 [String串类操作练习 - 文件名与邮箱验证][String_ -]**

package step3;
    
    public class HelloWorld {
    
    	public void judge(String fileName,String email){
    		//请在此添加实现代码
    /********** Begin **********/
    if (fileName.lastIndexOf(".")==-1) {
    	System.out.println("Java文件名无效");
    } else {
    	String temp = fileName.substring(fileName.lastIndexOf("."));
    	if (fileName.equals(".java")||temp.equals(".java")==false) {
    		System.out.println("Java文件名无效");
    	} else {
    		System.out.println("Java文件名正确");
    	} 
    }
    int a = email.indexOf('@') , b = email.indexOf('.');
    if (a!=-1&&b!=-1&&email.lastIndexOf('@')<email.indexOf('.')) {
    	System.out.println("邮箱名正确");
    } else {
    	System.out.println("邮箱名无效");
    } 
    
    /********** End **********/
    	}
    	
    	
    }

**第4关 [StringBuffer类的定义和使用 - 字母反转][StringBuffer_ -]**

package step4;
    
    public class Reverse {
        public static StringBuffer start(String data) {
            StringBuffer ans = new StringBuffer("");
            /********** Begin *********/
            String [] strs = data.split(" ");
            for(int i = 0 ; i < strs.length ; i++ ){
                StringBuffer bns = new StringBuffer(strs[i]);
                ans.append(bns.reverse());
                ans.append(" ");
            }
    
    
            /********** End *********/
            return ans;
        }
    }

[length_compareTo_ -]: https://www.educoder.net/tasks/otlbia3z65fs
[substring_indexOf_ -]: https://www.educoder.net/tasks/tvmw25zfgry9
[String_ -]: https://www.educoder.net/tasks/x9amnyik56jv
[StringBuffer_ -]: https://www.educoder.net/tasks/semaifhryb5u