德.摩根De Morgan 和香农Shannon定理


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Java Base == & equals

  Tags:  Integer cache, == , equals This Blogger emphasizes that in actual development, developers should prioritize using .equals() to compare object values ​​rather than simply relying on == to compare references. Java's Integer cache mechanism provides memory optimization for Java programs with values ​​in the range of -128 to 127.However, values ​​outside this range will result in the creation of new objects, resulting in unexpected results in == comparisons.       public static void main(String[] args) {         Integer a = 228;         Integer b = 228;         System.out.println(a == b); // false         Integer x = 1;         Integer y = 1;         System.out.println(x == y); // true         Integer c = 228;         Integer d = 228;         System.out.println(System.identityHash...
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distributed transaction solution - Seata

 Distributed Transaction Solution GTS(Global Transaction Service) ACID XA(eXtended Architecture) X/Open. TM(Transaction Manager), RM(Resource Manager), and Application Manager. XA->2PC(Prepare, commit, rollback)->TCC(Try,Confirm,Canccel)->3PC(CanCommit,PreCommit,DoCommit) Saga , 1987 year, by Hector and Kenneth for Long lived transaction. Princeton University Seata TXC->GTS->Seata->Seata GA TC(Transaction Coordinator),TM(Transaction Manager),RM(Resource Manager). http://seata.io/en-us/docs/overview/what-is-seata.html XID - Transaction ID TC - Transaction Coordinator Maintain status of global and branch transactions, drive the global commit or rollback. TM - Transaction Manager Define the scope of global transaction: begin a global transaction, commit or rollback a global transaction. RM - Resource Manager Manage resources that branch transactions working on, talk to TC for registering branch transactions and reporting status of branch transactions, and driv...
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Input in element.eleme.io

Input Input data using mouse or keyboard. Input is a controlled component, it always shows Vue binding value . Under normal circumstances, input event should be handled. Its handler should update component's binding value (or use v-model ). Otherwise, input box's value will not change. Do not support v-model modifiers. ¶ Basic usage < el-input placeholder = "Please input" v-model = "input" > </ el-input > < script > export default { data() { return { input : '' } } } </ script > Hide ¶ Disabled Disable the Input with the disabled attribute. < el-input placeholder = "Please input" v-model = "input" :disabled = "true" > </ el-input > < script > export default { data() { return { input : '' } } } </ script > ¶ Clearable Make the Input clearable with the...
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