{"id":10761,"date":"2022-09-24T22:05:12","date_gmt":"2022-09-24T16:35:12","guid":{"rendered":"http:\/\/jassweb.com\/solved\/solved-i-am-new-to-programming-and-i-cant-tell-if-this-error-is-occurring-because-of-my-syntax\/"},"modified":"2022-09-24T22:05:12","modified_gmt":"2022-09-24T16:35:12","slug":"solved-i-am-new-to-programming-and-i-cant-tell-if-this-error-is-occurring-because-of-my-syntax","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-i-am-new-to-programming-and-i-cant-tell-if-this-error-is-occurring-because-of-my-syntax\/","title":{"rendered":"[Solved] I am new to programming and I can’t tell if this error is occurring because of my syntax"},"content":{"rendered":"

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You are using equals<\/code> method with your custom object Student<\/code>. <\/p>\n

You need to override it in your Student<\/code> class. In your case, if you want to match all fields of s1<\/code> to s2<\/code>, your implementation should go like this:<\/p>\n

\/\/Overriding equals\n public boolean equals(Object obj) \n  {\n    if (this == obj) return true;\n    if (obj == null) return false;\n    if (this.getClass() != obj.getClass()) return false;\n    Student that = (Student) obj;\n    if (!this.name.equals(that.name)) return false;\n    if (!this.ssn.equals(that.ssn)) return false;\n    if (!this.gpa.equals(that.gpa)) return false;\n    return true;\n  }\n}\n<\/code><\/pre>\n
Doing this will give you expected results when doing s1.equals(s2)<\/code>.<\/p>\n
But, say for example if you try to add these same objects s1<\/code> and s2<\/code> to a Set<\/code>, it will consider them as different. The reason being, the hashcode for both will be different.<\/p>\n
So, when you override equals<\/code>, you should also override the hashcode<\/code> method.<\/p>\n
A sample implementation for it, considering you have some Id<\/code> field in your Student<\/code> class is:<\/p>\n
@Override\npublic int hashCode()\n{\n    final int PRIME = 31;\n    int result = 1;\n    result = PRIME * result + getId();\n    return result;\n}\n<\/code><\/pre>\n
You should use same fields to implement both equals<\/code> and hashcode<\/code> methods.<\/p>\n
After doing this, your code should give you expected results.<\/p>\n
Hope that helps!<\/p>\n<\/p><\/div>\n
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            1<\/span> <\/p><\/div>\n<\/div>\n
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solved I am new to programming and I can’t tell if this error is occurring because of my syntax <\/p>\n","protected":false},"excerpt":{"rendered":"
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In your case, if you want to match all fields of s1 to s2, your implementation should go like this: \/\/Overriding equals public boolean equals(Object obj) { if (this == obj) return true; if (obj … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[323,393],"class_list":["post-10761","post","type-post","status-publish","format-standard","hentry","category-solved","tag-java","tag-syntax"],"yoast_head":"\n[Solved] I am new to programming and I can't tell if this error is occurring because of my syntax - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-i-am-new-to-programming-and-i-cant-tell-if-this-error-is-occurring-because-of-my-syntax\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] I am new to programming and I can't tell if this error is occurring because of my syntax - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You are using equals method with your custom object Student. 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