如何输入字符并输出一定次数？

Question

我必须编写一个程序，需要输入两个字符，并使用方法将它们打印出x次。到目前为止，它会输出数字而不是字符。我该如何解决它？

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

这是因为添加字符不是串接。请参阅此问题：In Java, is the result of the addition of two chars an int or a char?

你想要的是包含两个字符，可能是最短的编辑是一个字符串：

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

Answer 2

传递的char Character.toString(char)将其转换为一个String。

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