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public static void func(double x){
  x=3*x
}
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double d=10;
func(10);
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public static void func(employe x) //employe¶ÔÏóÔÚÏÂÃæ¸ø³ö¡£
{
  x.setage(20);
}
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func(harry);
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class employer{
 private String name;
 private int age;
 private String addr;
 public employer(String a,int b,String c){
  name=a;
  age=b;
  addr=c;
  }
 public void setname(String name){
  this.name=name;
  }
 public String getname(){
  return name;
  }
 public void setage(int age){
  this.age=age;
  }
 public int getage(){
  return age;
  }
 public void setaddr(String addr){
  this.addr=addr;
  }
 public String getaddr(){
  return addr;
  }
 }
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