圖書名字判斷不了啊
因?yàn)槠鶈?wèn)題我就只把執(zhí)行相關(guān)的部分貼出來(lái)：
static String tushu[]={"論語(yǔ)","高數(shù)","數(shù)據(jù)結(jié)構(gòu)","單片機(jī)應(yīng)用","JAVA入門"}; //這部分是數(shù)組的代碼
case "1":
System.out.println("輸入圖書名稱：");
String name=s.nextLine();
name=name.trim();
System.out.println(tushu[0]);
for(int i=0;i<tushu.length;i++){
if(tushu[i]==name){
System.out.println("book:"+name);
break;
}//這不部分是選擇圖書名稱匹配的代碼 ? 就是這里判斷不出來(lái)。輸出什么都試過(guò)了，就是進(jìn)不了這個(gè)循環(huán)
if(i==(tushu.length-1)){
throw new NullPointerException("圖書不存在");
}
}
break;
2016-03-21
字符串對(duì)比 需要用到equals ???if(tushu[i]==name)你這句改成??if(tushu[i].equals(name))
2016-03-06
說(shuō)錯(cuò)了，是那個(gè)if判斷進(jìn)不去
2016-03-06
package?模擬借書系統(tǒng); import?java.util.Scanner; public?class?BorrowBooks?{ static?String?tushu[]={"論語(yǔ)","高數(shù)","數(shù)據(jù)結(jié)構(gòu)","單片機(jī)應(yīng)用","JAVA入門"}; public?static?void?main(String[]?age){ boolean?cc=true; while(cc){ try?{ System.out.println("輸入命令：1-按照名稱查找圖書：2-按照標(biāo)號(hào)查找圖書"); Scanner?s=?new?Scanner(System.in); String?a=s.nextLine(); switch?(a)?{ case?"1": System.out.println("輸入圖書名稱："); String?name=s.nextLine(); name=name.trim(); System.out.println(tushu[0]); for(int?i=0;i<tushu.length;i++){ if(tushu[i]==name){//這個(gè)循環(huán)進(jìn)不去 System.out.println("book:"+name); break; } if(i==(tushu.length-1)){ throw?new?NullPointerException("圖書不存在"); } } break; case?"2": System.out.println("請(qǐng)輸入圖書編號(hào)："); String?text=s.nextLine(); int?n=Integer.parseInt(text); System.out.println("book:"+tushu[n-1]); break; default: throw?new?typeException("輸入命令錯(cuò)誤，請(qǐng)按要求輸入命令"); } cc=false; }?catch?(typeException?e)?{ //?TODO?自動(dòng)生成的?catch?塊 System.out.println("輸入命令錯(cuò)誤，請(qǐng)按要求輸入命令！"); }catch(NullPointerException?e){ System.out.println("圖書不存在！"); }catch(NumberFormatException?e){ System.out.println("請(qǐng)按要求輸入數(shù)字！"); } } } } class?typeException?extends?Exception?{ /** ?*? ?*/ private?static?final?long?serialVersionUID?=?1L; public?typeException(){}; public?typeException(String?a){ super(a); } }全部貼出來(lái) 大家看看哪里有問(wèn)題啊