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public class Test1{
 private int id;
 private String name;
 private Date birthday;

 ...
 // getterºÍsetter·½·¨Ê¡ÂÔÁË
}

public class¡¡Test2{
 public static void main(String[] args){
  Test1 t1=new Test1();
  
  // ÔÚÕâÀÈçºÎµÃµ½ t1¶ÔÏóÖÐ idµÄÊôÐÔÊÇint,nameµÄÊôÐÔÊÇString£¬birthdayµÄÊôÐÔÊÇDate ?
 }
}

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ÎҼǵúÃÏñÊÇbean-utilÖ®ÀàµÄÃû×Ö

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Java code:
public class A {

public static void main(String[] args) {
Object s = "123";
if (s instanceof String) {
System.out.println("s is String");
}

int i = 2;
String str = "0";
str += i;
System.out.println(str);
if (str.matches("[0-9]+")) {
System.out.println("i is a int!");
}
}

}


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Java code

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Code hig