java - Java 中的 ArrayList 和更多原始类型一起使用

Question

我需要创建一个包含多个基本类型的 Java 数组列表(准确地说是一个 vector )。 例如，我想在每个 vector 的行中看到以下内容:

row[0] --> "str1", 5, "str2", "str3", 3.5, 6, "str4"...etc...
row[1] --> "str5", 6, "str6", "str7", 5.3, 8, "str8"...etc...

你能帮我吗？

谢谢!! :)

Answer 1

我认为这可以解决您的问题。我编写了一个适用于整数、字符串和 float 的代码(其余的你可以完成)。

主要(包含您的值(value)观)

public static void main(String[] args) {
        //Init
        ArrayList<ArrayList<Something>> mainList = new ArrayList<>();
        ArrayList<Something> sublist1 = new ArrayList<>();
        ArrayList<Something> sublist2 = new ArrayList<>();
        //Fill array lists
        sublist1.add(new Something("str1", 0));
        sublist1.add(new Something(5, 1));
        sublist1.add(new Something("str2", 0));
        sublist1.add(new Something("str3", 0));
        sublist1.add(new Something(3.5f, 2));
        //etc
        sublist2.add(new Something("str5", 0));
        sublist2.add(new Something(6, 1));
        sublist2.add(new Something("str6", 0));
        sublist2.add(new Something("str7", 0));
        sublist2.add(new Something(5.3f, 2));
        //etc
        //Add the two list in the main
        mainList.add(sublist1);
        mainList.add(sublist2);
        //Iterator
        int i = 0;
        for (ArrayList<Something> sublist : mainList) {
            i++;
            System.out.println("Results from list " + i);
            for (Something something : sublist) {
                switch (something.getType()) {
                    case 0: {
                        System.out.println("String value: " + (String) something.getValue());
                        break;
                    }
                    case 1: {
                        System.out.println("Integer value: " + (Integer) something.getValue());
                        break;
                    }
                    case 2: {
                        System.out.println("Float value: " + (Float) something.getValue());
                        break;
                    }


                }
            }
        }

    }

类的东西:

public static class Something {

        private Object value;
        private int type;

        /**
         * Constructor of Something class
         *
         * @param value
         * @param type type 0 String <br/>
         * type 1 Integer <br/>
         * type 2 float ....
         */
        public Something(Object value, int type) {
            this.value = value;
            this.type = type;
        }

        public Object getValue() {
            return value;
        }

        public void setValue(Object value) {
            this.value = value;
        }

        public int getType() {
            return type;
        }

        public void setType(int type) {
            this.type = type;
        }

    }

主要输出:

Results from list 1
String value: str1
Integer value: 5
String value: str2
String value: str3
Float value: 3.5
Results from list 2
String value: str5
Integer value: 6
String value: str6
String value: str7
Float value: 5.3