组装

package mytext;

public interface cpu {
    
    //开机
    public boolean kaiji();
    
    //屏幕亮度
    public void liangdu();

    //电量
    public void dianliang(double dl);

}

package mytext;

public class Cp implements cpu {

    @Override
    public boolean kaiji() {
        // TODO 自动生成的方法存根
        return false;
    }

    @Override
    public void liangdu() {
        // TODO 自动生成的方法存根
        
    }

    @Override
    public void dianliang(double dl) {
        // TODO 自动生成的方法存根
        
    }
}

package mytext;

public class dn {
    
    public dn(){
        
    }
    
    private Cp pm;

    public Cp getCpu() {
        return pm;
    }

    public void setCpu(Cp cpu) {
        this.pm = cpu;
    }
    
    private String diannao;
    
    private double dianliang = 80;

    public void dian(int i) {
        // TODO 自动生成的方法存根
        
    }
    
    private double liangdu=50;
    
    public void dian(double i){
        
    }
    
    boolean kaiji()
    {
        boolean rtn = true;
        
        if(dianliang<0)
        {
            
            System.out.println("电脑没电了");
        
            rtn = false;
        }
        else if(liangdu <30)
        {
            
            System.out.println("电量不足");
            
            rtn = false;
        }
        else
        {
             rtn=this.pm.kaiji();
        
            String ZhuangTai = "开机";
        }
        return rtn;
    }
    
    
    
    
    
    
}

package mytext;

public class DianNao {

    public static void main(String[] args) {
        
        dn d = new dn();
        
        d.dian(60);
        
        d.dian(0);
        
        d.setCpu(new Cp());
        
        for(int i=0;i<80;i++){
            int dianliang = 0;
            if(dianliang<30){
                break;
            }
        }
        

    }

}