如何輸入字符並輸出一定次數？

Question

我必須編寫一個程序，需要輸入兩個字符，並使用方法將它們打印出x次。到目前爲止，它會輸出數字而不是字符。我該如何解決它？

int length; 
char ch1; 
char ch2; 

System.out.print("Enter a character: "); 
ch1 = input.nextLine().charAt(0); //input refers to scanner. 
System.out.print("Enter second character: "); 
ch2 = input.nextLine().charAt(0); //input refers to scanner. 
System.out.print("Enter the length of the line: "); 
length = input.nextInt(); //input refers to how many times the characters ar$ 
draw_line(length, ch1, ch2); 

//Method starts here. 

public static void draw_line(int length, char ch1, char ch2){ 
    for (int i = 0; i < length; ++i){ 
     System.out.print(ch1 + ch2); 
    } 
} 

Answer 1

這是因爲添加字符不是串接。請參閱此問題：In Java, is the result of the addition of two chars an int or a char?

你想要的是包含兩個字符，可能是最短的編輯是一個字符串：

System.out.print("" + ch1 + ch2); 

Answer 2

傳遞的char Character.toString(char)將其轉換爲一個String。

System.out.print(Character.toString(ch1) + Character.toString(ch2));