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摘要： 1 public class ObjectDemo { 2 public static void main(String[] args) { 3 String str1="30"; 4 String str2="30.3"; 5 int x=Integer.parseInt(str1); 6 float f=Float.parseFloat(str2); 7 System.out.println("整数乘方"+x+"*"+x+"="+(x*x)); 8 System.out.println... 阅读全文

摘要： 1 class Person{ 2 private String name; 3 private int age; 4 public Person(String name,int age){ 5 this.name=name; 6 this.age=age; 7 } 8 public boolean equals(Object obj){ 9 if(this==obj)//地址相等？10 return true;11 if(!(obj instanceof Pers... 阅读全文

摘要： 1 import java.util.Scanner; 2 3 interface Pet{ 4 public int getAge(); 5 public String getColor(); 6 public String getName(); 7 } 8 9 class Cat implements Pet{ 10 private String name; 11 private String color; 12 private int age; 13 public Cat(String name,String... 阅读全文