{"id":26704,"date":"2022-12-19T13:03:49","date_gmt":"2022-12-19T07:33:49","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-wheres-the-benefit-of-static-typing-aka-why-wasnt-this-caught-java\/"},"modified":"2022-12-19T13:03:49","modified_gmt":"2022-12-19T07:33:49","slug":"solved-wheres-the-benefit-of-static-typing-aka-why-wasnt-this-caught-java","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-wheres-the-benefit-of-static-typing-aka-why-wasnt-this-caught-java\/","title":{"rendered":"[Solved] Where’s the benefit of static typing, aka why wasn’t this caught? Java"},"content":{"rendered":"

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printf()<\/code> takes a String and a vararg array of Objects as argument. Your program passes arguments that conform to these argument types, so the compiler is happy.<\/p>\n

The compiler would reject your method call if you did, for example<\/p>\n

Integer a = 23;\nSystem.out.printf(a, x);\n<\/code><\/pre>\n
because an Integer is not a String.<\/p>\n
It seems like you think static typing makes runtime errors impossible. That’s not the case at all. The compiler doesn’t know what printf() does and what those %s<\/code> mean in the String. It doesn’t know that the number of %s<\/code> is supposed to match the number of arguments passed to the method. And even if it did, you could pass a variable of type String, and a variable of type Object[] to the method, whose length and values are only known at runtime, and not at compile time. For example:<\/p>\n
String s = readPatternFromUser();\nObject o = readFirstArgFromUser();\nSystem.out.print(s, o);\n<\/code><\/pre>\n<\/p><\/div>\n
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            3<\/span> <\/p><\/div>\n<\/div>\n
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solved Where’s the benefit of static typing, aka why wasn’t this caught? Java <\/p>\n","protected":false},"excerpt":{"rendered":"
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