（Java）如何让这些循环每次都生成一个新字符串？

Question

Ok, so hoehe and breite are two ints that are grabbed from console input earlier. This works flawlessly. Now I want it to generate a random string with the lenght being the value of breite, print that out and then do that hoehe times. The only Characters the string can have are / and \ . Right now it generates the string one time and then prints it out hoehe times.

int i = 0;
int y = 0;
double rand;
String output = "";
String case1 = "/";
String case2 = "\\";
while (y < hoehe) {
  while (i < breite) {
    rand = Math.random();
    if (rand < 0.5) {
      output += case1;
     }
    else {
        output += case2;
      }
        i++;
    }
    System.out.println(output);
    y++;

}

Answer 1

You never reset i . Use for-loops instead:

double rand;
String output = "";
String case1 = "/";
String case2 = "\\";
for(int y = 0; y < hoehe; ++y) {
    for(int i = 0; i < breite; ++i) {
      rand = Math.random();
      if (rand < 0.5) {
        output += case1;
      }
      else {
        output += case2;
      }
    }
    System.out.println(output);
  }
}

Answer 2

int i = 0;
int y = 0;
double rand;
String output = "";
String case1 = "/";
String case2 = "\\";
  while (y < hoehe) {
    while (i < breite) {
      rand = Math.random();
      if (rand < 0.5) {
        output += case1;
      }
      else {
        output += case2;
      }
        i++;
    }
    i = 0;  //////  add this
    System.out.println(output);
    y++;
  }