public class Computer { //定义类
    //定义属性
    String cpu ; //中央处理器
    String Motherboard; //主板
    String Display; //显示器
    String HardDisk; //硬盘
    String Memory; //内存
    //定义方法
    public String toString(){
        return "中央处理器:RR4\t"+cpu+"主板:1.7GHZ\t"+Motherboard+"显示器:1024*768\t"+Display+"硬盘:1000G\t"+HardDisk+"内存:10G\t"+Memory;
    }
    public static void main(String[] args) {
        Computer center = new Computer (); //创建对象
        System.out.println(center);    //使用toString调用
    }
}

public class Computer { 
    private String cpu ;
    private String Motherboard; 
    private String Display; 
    private String HardDisk;
    private String Memory;
    
    public Computer() {
        super();
    }
    public Computer(String cpu, String motherboard, String display,
            String hardDisk, String memory) {
        super();
        this.cpu = cpu;
        Motherboard = motherboard;
        Display = display;
        HardDisk = hardDisk;
        Memory = memory;
    }
    public String toString(){
        return "中央处理器:RR4\t"+cpu+"主板:1.7GHZ\t"+Motherboard+"显示器:1024*768\t"+Display+"硬盘:1000G\t"+HardDisk+"内存:10G\t"+Memory;
    }
    public static void main(String[] args) {
        Computer center = new Computer ("i7","华硕H67","三星","希捷2TB","4G"); 
        System.out.println(center);  
    }
}

------解决方案--------------------

Java code

public class Computer { 
    private String cpu ;
    private String Motherboard; 
    private String Display; 
    private String HardDisk;
    private String Memory;
    
    public String getCpu(){
          return this.cpu ;
      }
      public void setCpu(String cpu){
           this.cpu = cpu ;    
    }
    public Computer() {
        super();
    }
    
    //其他属性的setter 和getter方法
    public Computer(String cpu, String motherboard, String display,
            String hardDisk, String memory) {
        super();
        this.cpu = cpu;
        Motherboard = motherboard;
        Display = display;
        HardDisk = hardDisk;
        Memory = memory;
    }
    
    @Override
    public String toString(){
        return "中央处理器:"+cpu+" , 主板:"+Motherboard+" , 显示器:1024*768\t"+Display+
        " , 硬盘:1000G\t"+HardDisk+" , 内存:10G\t"+Memory;
    }
    public static void main(String[] args) {
        Computer center = new Computer ("i7","华硕H67","三星","希捷2TB","4G"); 
        System.out.println(center);  
    }
}