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使用equals（）方法。
// 来自 nowjava public class Main { public static void main(String[] args) { // Compare if two objects contain the same values Team team1 = new Team(); Team team2 = new Team(); team2.setName("Bates"); team2.setCity("York"); if (team1.equals(team2)){ System.out.println("These object references contain the same values."); } else { System.out.println("These object references do NOT contain the same values."); } // Compare two objects to see if they refer to the same object Team team3 = team1; Team team4 = team1; if (team3.equals(team4) ) { System.out.println("These object references refer to the same object."); } else {// from nowjava - 时代Java System.out .println("These object references do NOT refer to the same object."); } } } class Team { private String name; private String city; private volatile int cachedHashCode = 0; /** * @return the name */ public String getName() { return name; } /** * @param name * the name to set */ public void setName(String name) { this.name = name; } /** * @return the city */ public String getCity() { return city; } /** * @param city * the city to set */ public void setCity(String city) { this.city = city; } public String getFullName() { return this.name + " - " + this.city; } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj instanceof Team) { Team other = (Team) obj; return other.getName().equals(this.getN