Java smart cards, with their core capabilities including an isolated secure sandbox operating environment, EAL4+ to EAL7+ high-level security certification, OTA remote dynamic updates, and independent isolation for multiple applications, fully adapt to the needs of financial-grade security and cross-scenario reuse. Deeply integrated with international/industry standards such as ISO/IEC, EMV, PBOC, and ICAO, they have been widely applied in six core areas: small-amount payments, social security and public services, telecommunications, cryptocurrency, financial payments, and government identity verification. They have become a key technology supporting digital payments, identity authentication, government services, mobile communications, and digital asset security, providing secure, convenient, and flexible intelligent hardware support for various industries.