判断包装类值是否相等

• 先了解包装类的拆包和封包

https://www.cnblogs.com/dolphin0520/p/3780005.html

• Integer 对象判断是否相等

见 https://blog.youkuaiyun.com/qq_40983603/article/details/78515412

public boolean equals(Object var1) {
        if (var1 instanceof Integer) {
            return this.value == (Integer)var1;
        } else {
            return false;
        }
    }

public static Integer valueOf(int var0) {
        return var0 >= -128 && var0 <= Integer.IntegerCache.high ? Integer.IntegerCache.cache[var0 + 128] : 
new Integer(var0);
    }

• String类判断相等
•  字符串及字符串常量池  https://www.cnblogs.com/javaminer/p/3923484.html
• JVM之String字符串  https://blog.youkuaiyun.com/weixin_42812986/article/details/107952456

public boolean equals(Object var1) {
        if (this == var1) {
            return true;
        } else {
            if (var1 instanceof String) {
                String var2 = (String)var1;
                int var3 = this.value.length;
                if (var3 == var2.value.length) {
                    char[] var4 = this.value;
                    char[] var5 = var2.value;

                    for(int var6 = 0; var3-- != 0; ++var6) {
                        if (var4[var6] != var5[var6]) {
                            return false;
                        }
                    }

                    return true;
                }
            }

            return false;
        }
    }

public static String valueOf(char var0) {
        char[] var1 = new char[]{var0};
        return new String(var1, true);
    }