1. 數組實現拼接

int[] arr ={11,22,33,44,55,66};

System.out.print("[");

for (int i = 0; i

if (i==arr.length-1){

System.out.print(arr[i]);

}else {

System.out.print(arr[i]+", ");

}

}

System.out.println("]");

2. String實現字符串拼接

String[] arr={"11","22","33","44","55"};

String s="[";

for (int i = 0; i

if (i==arr.length-1)

s+=arr[i];

else {

s+=arr[i]+", ";

}

}

s+="]";

System.out.println(s);

3. StringBuilder實現字符串拼接

String[] ss ={"11","12","13","14","15"};

StringBuilder s =new StringBuilder();

s.append("[");

for (int i = 0; i

if (i==ss.length-1){

s.append(ss[i]);

}else {

s.append(ss[i]).append(", ");

}

}

s.append("]");

String s1 =s.toString();

System.out.println(s1);

4.數組實現反轉

int[] arr={11,22,33,44,55,66};

for (int start=0,end=arr.length-1;start<=end;start++,end--){

int tmp = arr[start];

arr[start]=arr[end];

arr[end]=tmp;

}

System.out.print("[");

for (int i = 0; i

if (i==arr.length-1){

System.out.print(arr[i]);

}

else {

System.out.print(arr[i]+", ");

}

}

System.out.println("]");

5. 字符串實現反轉

Scanner sc =new Scanner(System.in);

System.out.println("請您輸入字符串:");

String s = sc.nextLine();

String s1="";

for (int i = s.length()-1; i >=0 ; i--) {

s1+=s.charAt(i);

}

System.out.println(s1);

6.使用StringBuilder實現反轉

Scanner sc =new Scanner(System.in);

System.out.println("請您輸入字符串:");

String s = sc.nextLine();

StringBuilder s2 =new StringBuilder(s);

s2.reverse();

String s3=s2.toString();

System.out.println(s3);

總結

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