Java Generics Series - Objects using generic methods (with examples)

Original URL: Java Generics Series - Objects using generic methods (with examples)_IT Knives Out Blog-CSDN Blog

Introduction

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This article introduces how Java uses generics on objects.

Overview

Generics can be specified when creating a new object.

Generic class

package com.example.a;

class Point<T> {
    private T var;

    public T getVar() {
        return var;
    }

    public void setVar(T var) {
        this.var = var;
    }
}

Test class

package com.example.a;

public class Demo {
    public static void main(String[] args) {
        Point<Integer> point = new Point<>();
        point.setVar(20);
        System.out.println(point.getVar());

        Point<String> point2 = new Point<>();
        point2.setVar("aa");
        System.out.println(point2.getVar());
    }
}

test

20
aa