Java:将字符串的值赋给

不能使用变量名调用变量,例如,需要将它们存储在数组中:

String[] operators = {n0, n1, n2, n3};
// or directly 
//String[] operators = {"&", "|", "^", "~"};
for (int n = 0; n < 4; n++) {
    if (n < 3) {
        String operator = operators[n];
        System.out.print(operator);
        // or directly 
        //System.out.print(operators[n]);
    }
}

您尝试按名称访问变量,但这是不可能的,相反,您可以创建一个包含键的映射 n1, n2, .. ,期望值如下:

Map<String, String> map = Map.of("n0", "&", "n1", "|", "n2", "^", "n3", "~");

String operator = "n" + n;
System.out.println(map.get(operator));

完整的代码可以是这样的:

Map<String, String> map = Map.of("n0", "&", "n1", "|", "n2", "^", "n3", "~");
for (int n = 0; n < map.size(); n++) {
    if (n < 3) {
        System.out.println(map.get("n" + n));
    }
}

您可能需要使用数组,请参见:

https://docs.oracle.com/javase/tutorial/java/nutsandbolts/arrays.html

    int[] anArray;

分为:

    String[] anArray;

图德尔

String n0 = "&";
String n1 = "|";
String n2 = "^";
String n3 = "~";
String[] operators = {n0, n1, n2, n3};
for (int i = 0; i < operators.length; i++) {
    String operator = operators[i];
    System.out.println(operator);
}

这段代码将变量添加到一个数组中,然后遍历这个数组并打印保存在数组中的值,即变量。