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public class ClassTest {
    public static void main(String[] args) {
        int age = ClassTest.classTest.age;
        System.out.println(age);
        String name = ClassTest.classTest.name;
        System.out.println(name);
        System.out.println(ClassTest.classTest);
    }

    private String name;
    private int age;
    static ClassTest classTest = new ClassTest("yhp", 23);

    public ClassTest(String name) {
        this.name = name;
    }

    public ClassTest(int age) {
        this.age = age;
    }

    public ClassTest(String name, int age) {
        this.name = name;
        this.age = age;