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请教 System.out.println("test " + s1=="Java"); Is this a bug?

摘要: 请教 System.out.println("test " + s1=="Java"); Is this a bug?

Hi,

public class testJava {

public static void main(String[] args) {
// TODO: Add your code here
String s1=-#34;Java-#34;;
System.out.println(-#34;test -#34; + s1==-#34;Java-#34;);
}
}

Output is -#34;false-#34;.

Thanks a lot.

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System.out.println(-#34;test -#34; + s1==-#34;Java-#34;); ＝＝》 (-#34;test-#34; + s1) == -#34;Java-#34; // false

System.out.println(-#34;test -#34; + (s1==-#34;Java-#34;)); ＝＝》 -#34;test -#34; + (s1 == -#34;Java-#34;) // test true

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a.equals(b)

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1。运算符优先级，2.==表示同一个对象， equals表示值相等
System.out.println(-#34;test -#34;+ s1.equals(-#34;java-#34;));

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public class testJava3 {

public static void main(String[] args) {
// TODO: Add your code here
String s1=-#34;Java-#34;;
System.out.println(-#34;test -#34; + s1==-#34;Java-#34; + -#34; we need ()-#34;);
}
}

Thank you all.
kevinliuu(@。@)

How do you explain System.out.println(-#34;test -#34; + s1==-#34;Java-#34; + -#34; we need ()-#34;)?
Output is false.

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貌似楼主不懂编程

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楼主希望输出什么?

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楼主不懂编程, that-#39;s why I ask, haha

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