我遇到的java问题

public class TestException5 { public static void main(String[] args) { int a=3; int b=0; try{ if(b==0)throw new ArithmeticException( ); System.out.println('a/b的值是：+a/b'); } catch(ArithmeticException e){ System.out.println('程序异常，b不能是0'); } System.out.println('运行结束'); }

}

运行时报下面的异常

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Exception in thread "main" java.lang.Error: Unresolved compilation problem:  Invalid character constant      

at gu.com.TestException5.main(TestException5.java:9)

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Invalid character constant   无效的字符常量      

超低级的错误，输出的括号内应该用双引号