如何在字符串中查找字符的出现次数

string = "hello world"
char = "l"
count = string.count(char)
print(count)

String string = "hello world";
char char = 'l';
int count = 0;
for (int i = 0; i< string.length(); i++) {
    if (string.charAt(i) == char) {
        count++;
    }
}
System.out.println(count);

let string = "hello world";
let char = "l";
let count = 0;
for (let i = 0; i< string.length; i++) {
    if (string.charAt(i) === char) {
        count++;
    }
}
console.log(count);