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View Compilation Error

0_0_37965449_7816\Main.java:1: 错误: 类sum是公共的, 应在名为 sum.java 的文件中声明
public static class sum {
              ^
0_0_37965449_7816\Main.java:16: 错误: 找不到符号
	Scanner sca=new Scanner(System.in);
	^
  符号:   类 Scanner
  位置: 类 test01
0_0_37965449_7816\Main.java:5: 错误: 找不到符号
		test01 t=new test01(new Scanner(System.in).nextInt());
		                        ^
  符号:   类 Scanner
  位置: 类 sum
0_0_37965449_7816\Main.java:16: 错误: 找不到符号
	Scanner sca=new Scanner(System.in);
	                ^
  符号:   类 Scanner
  位置: 类 test01
4 个错误


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