JAVA 最基础的 怎样写到一个里面 或者里面要包含这些 要基础

简单的java封装继承多态构造方法 抽象类 借口 异常处理写到一个里面

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public class lianxi1 {
    public static void main(String[] args) {
        System.out.println("封装get，set");
        final CPU cpu = new CPU();
        cpu.setSpeed(10.0);
        cpu.getSpeed();
        PC pc = new PC();
        pc.setCpu(cpu);
    }
    
    public static class CPU {
        private Double speed;
        
        public Double getSpeed() {
            return speed;
        }
        
        public void setSpeed(Double speed) {
            this.speed = speed;
        }
    }
    
    
    public static class PC {
        private CPU cpu;
        private HardDisk hardDisk;
        
        public CPU getCpu() {
            return cpu;
        }
        
        public PC(CPU cpu) {        //构造方法重载
            System.out.println("构造方法重载");
            this.cpu = cpu;
        }
        
        public PC() {
            System.out.println("构造方法");//构造方法
        }
        
        public HardDisk getHardDisk() {
            return hardDisk;
        }
        
        public void setHardDisk(HardDisk hardDisk) {
            this.hardDisk = hardDisk;
        }
        
        public void setCpu(CPU cpu) {
            this.cpu = cpu;
        }
        
        public void show() {
            System.out.println("CPU的速度" + cpu.getSpeed());
            System.out.println("硬盘容量" + hardDisk.getAmount());
            
        }
    }
    
    public class sun extends Father {
        public void show() {
            System.out.println("继承");
            System.out.println("sun");
        }
    }
    
    
    public class Father {
        int a = 1;
        
        public int getA() {
            return a;
        }
        
        public void setA(int a) {
            this.a = a;
        }
        
        public void show() {
            System.out.println("father");
        }
    }
    
    
    public abstract class chouxiang {
        abstract void chouxiangfangfa();
    }
    
    public class chouxiangImpl extends chouxiang {
        @Override
        void chouxiangfangfa() {
            System.out.println("抽象方法的继承");
        }
    }
    
    interface jiekou {
        void jiekou();
    }
    
    class jiekouImpl implements jiekou {
        
        @Override
        public void jiekou() {
            System.out.println("接口实现");
        }
    }
    
    
    class MyException extends Exception {
        //继承
        public void show() {
            super.getMessage();
            System.out.println("自定义Exception");
        }
    }
}