public?class?Telphone?{
????float?screen;
????float?cpu;
????float?mem;//屬性

????@Override
????public?boolean?equals(Object?o)?{
????????if?(this?==?o)?return?true;
????????if?(o?==?null?||?getClass()?!=?o.getClass())?return?false;
????????Telphone?telphone?=?(Telphone)?o;
????????return?Float.compare(telphone.screen,?screen)?==?0?&&
????????????????Float.compare(telphone.cpu,?cpu)?==?0?&&
????????????????Float.compare(telphone.mem,?mem)?==?0;//自動(dòng)生成的Object?判斷工具
????}



}

public?class?Initail?{
????public?static?void?main(String[]?args)?{
????????Telphone?telphone1=new?Telphone();
????????telphone1.?screen=1f;
????????telphone1.?cpu=2f;
????????telphone1.mem=3f;//telphone1賦值
????????Telphone?telphone2=new?Telphone();
????????telphone2.screen=1f;
????????telphone2.cpu=2f;
????????telphone2.mem=3f;//telphone2賦值
????????if(telphone1.equals(telphone2)){
????????????System.out.println("兩個(gè)手機(jī)是相同的!");
????????}
????????else{
????????????System.out.println("兩個(gè)手機(jī)是不同的");
????????}//判斷
????}
}

1. 沒(méi)有限制
   

2. 三個(gè)分別比較，都相同則相同