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Similar to Bug 545342, it will be good to have a quick assist to convert if statement to switch expression. public static void foo(int num) { int res; if (num == 100) { res = 1; } else if (num == 200) { res = 2; } else if (num == 300 || num == 3000) { res = 3; } else if (num == 400) { res = 4; } else { res = -1; } } public static void foo1(int num) { int res= switch (num) { case 100-> 1; case 200-> 2; case 300,3000-> 3; case 400-> 4; default -> -1; }; }