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System.out.print("グーなら0、チョキなら1、パーなら2を入力してください。>");
	int myHand = new java.util.Scanner(System.in).nextInt();
	if (!(myHand == 0 || myHand == 1 || myHand == 2)) {
		System.out.println("指定された値を入力してください。終了します。");
		System.exit(1);
	}

Main.java:1: error: class, interface, or enum expected
System.out.print("????0??????1?????2??????????>");
^
Main.java:2: error: class, interface, or enum expected
	int myHand = new java.util.Scanner(System.in).nextInt();
	^
Main.java:3: error: class, interface, or enum expected
	if (!(myHand == 0 || myHand == 1 || myHand == 2)) {
	^
Main.java:5: error: class, interface, or enum expected
		System.exit(1);
		^
Main.java:6: error: class, interface, or enum expected
	}
	^
5 errors

Standard output is empty