TestStringEquals.java

class A { public int i; public A(int i) { this.i = i; } public boolean equals(Object obj) { A aa = (A)obj; if(this.i == aa.i) return true; else return false; } } public class TestStringEquals { public static void main(String[] args) { A aa1 = new A(2); A aa2 = new A(2); System.out.println(aa1); System.out.println(aa2); System.out.println( aa1.equals.(aa2) ); if(aa1 == aa2) System.out.printf("aa1和aa2ppp\n"); else System.out.printf("aa1和aa2xxx\n"); } } 下面是出错信息: D:\java1>javac TestStringEquals.java TestStringEquals.java:30: : Ҫ<ʶ> System.out.println( aa1.equals.(aa2) );